| **BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Policies)**           | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| **Accounting Policies [Abstract]**                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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| Basis of Presentation                                                  | Basis of PresentationThese Condensed Consolidated Financial Statements include the accounts of the Company and its subsidiaries, including its principal subsidiary, the Bank, and certain special purpose financing trusts utilized in financing transactions which are considered VIEs. The Company consolidates VIEs for which it is deemed the primary beneficiary. The Condensed Consolidated Financial Statements have been prepared by the Company, without audit, pursuant to SEC regulations. All intercompany balances and transactions have been eliminated in consolidation. Certain information and footnote disclosures normally included in the Condensed Consolidated Financial Statements, prepared in conformity with accounting principles generally accepted in the United States (“GAAP”), have been omitted pursuant to such regulations. Additionally, where applicable, the Company's accounting policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. However, in the opinion of management, the accompanying unaudited Condensed Consolidated Financial Statements reflect all adjustments of a normal and recurring nature necessary to present fairly the Condensed Consolidated Balance Sheets, Statements of Operations, Statements of Comprehensive Income, Statement of Stockholder's Equity and Statements of Cash Flows for the periods indicated, and contain adequate disclosure to make the information presented not misleading.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Consolidation                                                          | ConsolidationThe Condensed Consolidated Financial Statements include voting rights entities or VIEs in which the Company has a controlling financial interest. In accordance with the applicable accounting guidance for consolidations, the Company consolidates a VIE if the Company is considered to be the primary beneficiary because it has: (i) a variable interest in the entity; (ii) the power to direct activities of the VIE that most significantly impact the entity's economic performance; and (iii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. Variable interests can include equity interests, subordinated debt, derivative contracts, leases, service agreements, guarantees, standby letters of credit, loan commitments, and other contracts, agreements and financial instruments. The Company uses the equity method to account for unconsolidated investments in voting rights entities if the Company has influence over the entity's operating and financing decisions but does not maintain a controlling financial interest. Unconsolidated investments in voting rights entities or VIEs in which the Company has a voting or economic interest of less than 20% generally are carried at cost. These investments are included in "Equity method investments" on the Condensed Consolidated Balance Sheet, and the Company's proportionate share of income or loss is included in "Equity method investments" within the Consolidated Statements of Operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| Business Combinations                                                  | Business CombinationsThe Company records the identifiable assets acquired, the liabilities assumed, and any non-controlling interests of companies that are acquired at their estimated fair value at the date of acquisition, and includes the results of operations of the acquired companies in the Condensed Consolidated Statement of Operations from the date of acquisition. The Company recognizes as goodwill the excess of the acquisition price over the estimated fair value of the net assets acquired. As discussed above, the Company has accounted for its acquisition of SCUSA as a business combination. See Note 3 for a detailed discussion of this transaction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| Use of Estimates                                                       | Use of EstimatesThe preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The most significant estimates pertain to consolidation, fair value measurements, allowance for loan losses and reserve for unfunded lending commitments, estimates of expected residual values of leased vehicles subject to operating leases, goodwill, derivatives and hedge activities, and income taxes. Actual results may differ from the estimates, and the differences may be material to the Condensed Consolidated Financial Statements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Subsequent Events                                                      | Subsequent EventsThe Company evaluated events from the date of the Condensed Consolidated Financial Statements on September 30, 2014 through the issuance of these Condensed Consolidated Financial Statements and has determined that there have been no material events that would require recognition in its Condensed Consolidated Financial Statements or disclosure in the Notes to the Condensed Consolidated Financial Statements for the quarter ended September 30, 2014 other than the transactions disclosed with the footnotes. See Note 4, 5, and 10 of these Condensed Consolidated Financial Statements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| Revenue Recognition                                                    | Revenue Recognition The Company earns interest and non-interest income from various sources, including: •Lending •Investment securities •Customer deposit fees •BOLI•Loan sales and servicing •Securities and derivatives trading activities, including foreign exchange transactions•LeasesThe principal source of revenue is interest income from loans and investment securities. Interest income is recognized on an accrual basis primarily according to non-discretionary formulas in written contracts, such as loan agreements or securities contracts. Revenue earned on interest-earning assets, including unearned income and the accretion of discounts recognized on acquired or purchased loans, is recognized based on the constant effective yield of such interest-earning assets. Unearned income pertains to the net of fees collected and certain costs incurred from loan originations.Revenue on leases is generated through monthly lease payments and fees. Gains or losses on sales of investment securities are recognized on the trade date. The Company recognizes revenue from servicing commercial mortgages and consumer loans as earned. Mortgage banking revenue/(expense) includes fees associated with servicing loans for third parties based on the specific contractual terms and changes in the fair value of MSRs. Gains or losses on sales of residential mortgage, multi-family and home equity loans are included within mortgage banking revenues and are recognized when the sale is complete. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)Service charges on deposit accounts are recognized when earned. Income from BOLI represents increases in the cash surrender value of the policies, as well as insurance proceeds and interest.Income from finance leases is recognized as part of interest income over the term of the lease using the constant effective yield method; while income arising from operating leases is recognized as part of other non-interest income over the term of the lease on a straight-line basis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Fair Value Measurements                                                | Fair Value MeasurementsThe Company values assets and liabilities based on the principal market in which each would be sold (in the case of assets) or transferred (in the case of liabilities). The principal market is the forum with the greatest volume and level of activity. In the absence of a principal market, valuation is based on the most advantageous market. In the absence of observable market transactions, the Company considers liquidity valuation adjustments to reflect the uncertainty in pricing the instruments. The fair value of a financial asset is measured on a stand-alone basis and cannot be measured as a group, with the exception of certain financial instruments held and managed on a net portfolio basis. In measuring the fair value of a nonfinancial asset, the Company assumes the highest and best use of the asset by a market participant - not just the intended use - to maximize the value of the asset. The Company also considers whether any credit valuation adjustments are necessary based on the counterparty's credit quality.When measuring the fair value of a liability, the Company assumes that the transfer will not affect the nonperformance risk associated with the liability. The Company considers the effect of the credit risk on the fair value for any period in which fair value is measured. There are three acceptable techniques for measuring fair value: the market approach, the income approach and the cost approach. Selecting the appropriate technique for valuing a particular asset or liability depends on the exit price of the asset or liability being valued, and how a market participant would value the same asset or liability. Ultimately, selecting the appropriate valuation method requires significant judgment. Valuation inputs refer to the assumptions market participants would use in pricing a given asset or liability. Inputs can be observable or unobservable. Observable inputs are assumptions based on market data obtained from an independent source. Unobservable inputs are assumptions based on the Company's own information or assessment of assumptions used by other market participants in pricing the asset or liability. The unobservable inputs are based on the best and most current information available on the measurement date.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Cash and Cash Equivalents                                              | Cash and Cash EquivalentsCash and cash equivalents include cash and amounts due from depository institutions, interest-bearing deposits in other banks, federal funds sold, and securities purchased under agreements to resell. Cash and cash equivalents have maturities of three months or less, and, accordingly, the carrying amount of these instruments is deemed to be a reasonable estimate of fair value. As of September 30, 2014, the Company has maintained balances in various operating and money market accounts in excess of federally insured limits. Cash deposited to support securitization transactions, lockbox collections, and related required reserve accounts are recorded in the Company's Condensed Consolidated Balance Sheet as of September 30, 2014 as restricted cash. Excess cash flows generated by securitization trusts (the "Trusts") are added to the restricted cash reserve account, creating additional over-collateralization until the contractual securitization requirement has been reached. Once the targeted reserve requirement is satisfied, additional excess cash flows generated by the Trusts are released to the Company as distributions from the Trusts. Lockbox collections are added to restricted cash and released when transferred to the appropriate warehouse line of credit or Trust. The Company also maintains restricted cash primarily related to cash posted as collateral related to derivative agreements and cash restricted for investment purposes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Investment Securities and Other Investments                            | Investment Securities and Other Investments Investments that are purchased principally for the purpose of selling them in the near term are classified as trading securities and carried at fair value, with changes in fair value recorded as a component of the Condensed Consolidated Statements of Operations. Investment securities that the Company has the intent and ability to hold to maturity are classified as held-to-maturity and reported at amortized cost. Securities expected to be held for an indefinite period of time are classified as available for sale and are carried at fair value, with temporary unrealized gains and losses reported as a component of accumulated other comprehensive income within stockholder's equity, net of estimated income taxes. Available-for-sale and held-to-maturity securities are reviewed quarterly for possible other-than-temporary impairment (“OTTI”). The Company conducts a comprehensive security-level impairment assessment quarterly on all securities with a fair value that is less than their amortized cost basis to determine whether the loss represents OTTI. The quarterly OTTI assessment takes into consideration whether the Company has the intent to sell or is more likely than not that it will be required to sell the security before the expected recovery of its amortized cost. The Company also considers whether or not it would expect to receive all of the contractual cash flows from the investment based on its assessment of the security structure, recent security collateral performance metrics, external credit ratings, failure of the issuer to make scheduled interest or principal payments, judgment and expectations of future performance, and relevant independent industry research, analysis and forecasts. The Company also considers the severity of the impairment in its assessment. In the event of a credit loss, the credit component of the impairment is recognized within non-interest income, and the non-credit component is recognized through accumulated other comprehensive income. Realized gains and losses on sales of investments securities are included in earnings as part of non-interest income.Other investments primarily include the Company's investment in the stock of the FHLB of Pittsburgh and the FRB. Although FHLB stock is an equity interest in an FHLB, it does not have a readily determinable fair value, because its ownership is restricted and it is not readily marketable. FHLB stock can be sold back only at its par value of $100 per share and only to FHLBs or to another member institution. Accordingly, FHLB stock is carried at cost. The Company evaluates this investment for impairment on the ultimate recoverability of the par value rather than by recognizing temporary declines in value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Loans held for investment                                              | Loans held for investment Loans held for investment include commercial and consumer loans originated by the Company as well as retail installment and personal unsecured loans acquired in connection with the Change in Control. Loans held for investment Pre Change in ControlLoans held for investment are reported net of loan origination fees, direct origination costs and discounts and premiums associated with purchased loans and unearned income. Interest on loans is credited to income as it is earned. Loan origination fees and certain direct loan origination costs are deferred and recognized as adjustments to interest income in the Condensed Consolidated Statements of Operations over the contractual life of the loan generally utilizing the effective interest rate method. Premiums and discounts associated with loans purchased by the Bank are deferred and amortized as adjustments to interest income generally utilizing the effective interest rate method using estimated prepayment speeds, which are updated on a quarterly basis. Interest income is not recognized on loans when the loan payment is 90 days or more delinquent for commercial loans and consumer loans, including credit cards, or sooner if management believes the loan has become impaired. Credit cards are charged off when they are 180 days delinquent or within 60 days after the receipt of notification of the cardholder’s death or bankruptcy.NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)A loan is determined to be non-accrual when it is probable that scheduled payments of principal and interest will not be received when due according to the contractual terms of the loan agreement. When a loan is placed on non-accrual status, all accrued yet uncollected interest is reversed from income. When the collectability of the recorded loan balance of a nonaccrual loan is in doubt, any cash payments received from the borrower are applied first to reduce the carrying value of the loan. Otherwise, interest income may be recognized to the extent cash is received. Generally, a nonaccrual loan is returned to accrual status when all delinquent interest and principal become current under the terms of the loan agreement and the collectability of remaining principal and interest is no longer doubtful. Interest income recognition resumes for nonaccrual loans that were accounted for on a cash basis method when they returned to accrual status, while interest income that was previously recorded as reduction in the carrying value of the loan would be recognized as interest income based on the effective yield to maturity on the loan.When loans held for investment are re-designated as loans held for sale ("LHFS"), any specific and allocated allowance for credit losses are charged-off to reduce the basis of the loans to the lower of cost or estimated fair value. Retail installment contracts and Personal unsecured loansIncluded in loans held for investment are retail installment contracts and personal unsecured loans that were acquired in the Change in Control of SCUSA and which the Company intends to hold for the foreseeable future or until maturity. Retail installment contracts consist largely of nonprime automobile finance receivables that are acquired individually from dealers at a nonrefundable discount. Retail installment contracts also include receivables originated through a direct lending program and loan portfolios purchased from other lenders. Personal unsecured loans include both revolving and amortizing term finance receivables acquired individually and also include private label revolving lines of credit. Pre-Change in Control Retail installment contracts and Personal unsecured loans and Allowance for Loan LossesAs discussed above, the Company has accounted for its consolidation of SCUSA as a business combination. The retail installment contracts and personal unsecured loans were adjusted to fair value and their related allowance for loan losses that existed as of the Change in Control were eliminated. The portfolio acquired included performing loans as well as those loans acquired with evidence of credit deterioration (defined as those on non-accrual status at the time of the acquisition). All of SCUSA’s performing retail installment contracts and personal unsecured loans that are held for investment were recorded by the Company at a discount. Subsequent to the Change in Control, the purchase discounts on the retail installment loans will be accreted over the remaining expected lives of the loans to their par values using the effective interest rate method, while the purchase discount on the personal unsecured loans given their revolving nature will be amortized on a straight-line basis over 12 months. The Company assesses the collectability of the recorded investment in the retail installment contracts and personal unsecured loans on a collective basis quarterly and determines allowance for loan losses at levels considered adequate to cover probable credit losses inherent in the portfolio. The Company recognizes an allowance for loan loss through charge to provision expense when the recorded investment amounts would exceed unpaid principal balances net of estimated incurred losses.The Company has irrevocably elected to account for retail installment contracts acquired with evidence of credit deterioration at the Change in Control date at fair value in accordance with ASC 825. Accordingly, the Company will not recognize interest income for these retail installment contracts and will recognize the fair value adjustments of these loans as part of other non-interest income in the Company’s Condensed Consolidated Statement of Operations. For certain of the retail installment contracts which the Company has elected to account at fair value but are not considered non-accruals, the Company will separately recognize interest income from the total fair value adjustment. No allowance for loan losses will be recognized for loans that the Company has elected to account for at fair value.Post-Change in Control Retail installment contracts and Personal unsecured loans and Allowance for Loan LossesFinance receivables originated since the Change in Control are carried at amortized cost, net of allowance for loan losses. Provisions for loan losses are charged to operations in amounts sufficient to maintain the allowance for loan losses at levels considered adequate to cover probable credit losses inherent in our post acquisition finance receivables.NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)Interest from these loans is accrued when earned in accordance with the terms of the retail installment contracts. The accrual of interest is discontinued and reversed once a retail installment contract becomes more than 60 days past due, and is resumed if a delinquent account subsequently becomes 60 days or less past due. Unsecured revolving and term loans continue to accrue interest until they are 180 and 120 days past due, respectively, at which point they are charged off.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Troubled debt restructurings                                           | Troubled debt restructuringsTDRs are loans that have been modified for which the Company has agreed to make certain concessions to customers to both meet the needs of the customers and maximize the ultimate recovery of the loan. TDRs occur when a borrower is experiencing, or is expected to experience, financial difficulties and the loan is modified involving a concession that would otherwise not be granted to the borrower. TDRs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically defined as six months for a monthly amortizing loan). All costs incurred by the Company in connection with a TDR are expensed as incurred. The TDR classification remains on the loan until it is paid in full or liquidated.Impaired loans are defined as all TDRs plus non-accrual commercial loans in excess of $1 million as of the balance sheet date. The Company also considers all individually acquired retail installment contracts that have been modified at least once, deferred for a period of 90 days or more, or deferred at least twice as TDRs. In addition, the Company may perform a specific reserve analysis on loans that fail to meet this threshold if the nature of the collateral or business conditions warrant. As of September 30, 2014, the Company is performing a specific reserve analysis on certain loans within the Corporate Banking and remaining commercial classes of financing receivables, regardless of loan size.The Company measures impairment based on the present value of expected future cash flows discounted at the loan's effective interest rate, except that, as a practical expedient, the Company may measure impairment based on a loan's observable market price, or the fair value of the collateral if the loan is a collateral-dependent loan. A loan is considered to be impaired when, based upon current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan. An insignificant delay (e.g., less than 61 days for retail installment contracts or less than 90 days for all of the Company's other loans) or insignificant shortfall in amount of payments does not necessarily result in the loan being identified as impaired. In addition to those identified as TDRs above, the guidance also requires loans discharged under Chapter 7 bankruptcy to be considered TDRs and collateral-dependent, regardless of delinquency status. Collateral-dependent loans must be written down to fair market value and classified as non-accrual/non-performing for the remaining life of the loan. TDR Impact to Allowance for Loan LossesThe allowance for loan losses is established to recognize losses inherent in funded loans intended to be held for investment that are probable and can be reasonably estimated. Prior to loans being placed in TDR, the Company generally measures its allowance under a loss contingency methodology in which consumer loans with similar risk characteristics are pooled and loss experience information is monitored for credit risk and deterioration with statistical tools considering factors such as delinquency, LTVs and credit scores. Upon TDR modification, the Company generally measures impairment based on a present value of expected future cash flows methodology considering all available evidence using the effective interest rate or fair value of collateral. The amount of the required valuation allowance is equal to the difference between the loan’s impaired value and the recorded investment.When a consumer TDR subsequently defaults, the Company generally measures impairment based on the fair value of the collateral, if applicable, less its estimated cost to sell.Typically, commercial loans whose terms are modified in a TDR will have been identified as impaired prior to modification and accounted for generally using a present value of expected future cash flows methodology, unless the loan is considered collateral-dependent. Loans considered collateral-dependent are measured for impairment based on their fair values of collateral less its estimated cost to sell. Accordingly, upon TDR modification or if a TDR modification subsequently defaults, the allowance methodology remains unchanged.  Commercial Loan TDRsAll of the Company’s commercial loan modifications are based on the circumstances of the individual customer, including specific customers' complete relationship with the Company. Loan terms are modified to meet each borrower’s specific circumstances at a point in time. Modifications for commercial loan TDRs generally, although not always, result in bifurcation of the original loan into A and B notes. The A note is restructured to allow for upgraded risk rating and return to accrual status after a sustained period of payment performance has been achieved (typically six months for monthly payment schedules). The B note, if any, is structured as a deficiency note; the balance is charged off but the debt is usually not forgiven. As TDRs, they will be subject to analysis for specific reserves by either calculating the present value of expected future cash flows or, if collateral-dependent, calculating the fair value of the collateral less its estimated cost to sell. The TDR classification will remain on the loan until it is paid in full or liquidated.Consumer Loan TDRsThe primary modification program for the Company’s residential mortgage and home equity portfolios is a proprietary program designed to keep customers in their homes and, when appropriate, prevent them from entering into foreclosure. The program is available to all customers facing a financial hardship regardless of their delinquency status. The main goal of the modification program is to review the customer’s entire financial condition to ensure that the proposed modified payment solution is affordable according to a specific debt-to-income ratio (“DTI”) range. The main modification benefits of the program allow for term extensions, interest rate reductions, or deferment of principal. The Company reviews each customer on a case-by-case basis to determine which benefit or combination of benefits will be offered to achieve the target DTI range.For the Company’s other consumer portfolios, the terms of the modifications generally include one or a combination of the following: a reduction of the stated interest rate of the loan at a rate of interest lower than the current market rate for new debt with similar risk or an extension of the maturity date.Consumer TDRs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically six months for a monthly amortizing loan). Any loan that has remained current for the six months immediately prior to modification will remain on accrual status after the modification is enacted. Exceptions to this policy include retail installment contracts, which may begin accruing as soon as they are made current by the borrower. The TDR classification will remain on the loan until it is paid in full or liquidated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Loans Held-for-Sale                                                    | Loans Held-for-Sale LHFS are recorded at either estimated fair value (if the fair value option is elected) or the lower of cost or fair value. The Company has elected to account for residential real estate mortgages originated with the intent to sell at fair value. Generally, residential loans are valued on an aggregate portfolio basis, and commercial loans are valued on an individual loan basis. Gains and losses on LHFS which are accounted for at fair value are recorded in Other non-interest income. Direct loan origination costs and fees are recorded in Other non-interest income at origination. The fair value of LHFS is based on what secondary markets are currently offering for portfolios with similar characteristics, and related gains and losses are recorded in Non-interest income. All other LHFS, including retail installment contracts which the Company does not have the intent and ability to hold for the foreseeable future or until maturity or payoff, are carried at the lower of cost or fair value. For LHFS recorded at the lower of cost or fair value, direct loan origination costs and fees are deferred at origination and are recognized in Other non-interest income at the time of sale.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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| Allowance for Loan Losses and Reserve for Unfunded Lending Commitments | Allowance for Loan Losses and Reserve for Unfunded Lending Commitments The allowance for loan losses and reserve for unfunded lending commitments, collectively referred to as the “Allowance for credit losses,” are maintained at levels that management considers adequate to provide for losses based upon an evaluation of known and inherent risks in the loan portfolio. Management's evaluation takes into consideration the risks inherent in the loan portfolio, past loan loss experience, specific loans with loss potential, geographic and industry concentrations, delinquency trends, economic conditions and other relevant factors. While management uses the best information available to make such evaluations, future adjustments to the Allowance for credit losses may be necessary if conditions differ substantially from the assumptions used in making the evaluations.The allowance for loan losses consists of two elements: (i) an allocated allowance, which is comprised of allowances established on loans specifically evaluated for impairment and loans collectively evaluated for impairment based on historical loan loss experience adjusted for current trends and both general economic conditions and other risk factors in the Company's loan portfolios, and (ii) an unallocated allowance to account for a level of imprecision in management's estimation process. Reserve levels are collectively reviewed for adequacy and approved quarterly by Board-level committees. Management regularly monitors the condition of borrowers and assesses both internal and external factors in determining whether any relationships have deteriorated considering factors such as historical loss experience, trends in delinquency and non-performing loans, changes in risk composition and underwriting standards, experience and ability of staff and regional and national economic conditions and trends. For the commercial loan portfolio segment, the Company has specialized credit officers and workout units that identify and manage potential problem loans. Changes in management factors, financial and operating performance, company behavior, industry factors and external events and circumstances are evaluated on an ongoing basis to determine whether potential impairment is evident and additional analysis is needed. For the commercial loan portfolio segment, risk ratings are assigned to each loan to differentiate risk within the portfolio, and are reviewed on an ongoing basis by credit risk management and revised, if needed, to reflect the borrower's current risk profile and the related collateral positions. The risk ratings consider factors such as financial condition, debt capacity and coverage ratios, market presence and quality of management. Generally, credit officers reassess a borrower's risk rating on no less than an annual basis, and more frequently if warranted. This reassessment process is managed on a continual basis by the Credit Monitoring group to ensure consistency and accuracy in risk ratings as well as appropriate frequency of risk rating review by the Company's credit officers. The Company's Internal Audit group regularly performs loan reviews and assesses the appropriateness of assigned risk ratings. When a loan's risk rating is downgraded beyond a certain level, the Company's Workout Department becomes responsible for managing the credit risk. Risk rating actions are generally reviewed formally by one or more credit committees, depending on the size of the loan and the type of risk rating action being taken. Detailed analyses are completed that support the risk rating and management's strategies for the customer relationship going forward. The consumer loan portfolio segment and small business loans are monitored for credit risk and deterioration with statistical tools considering factors such as delinquency, LTV ratio, and credit scores. The Bank evaluates the consumer portfolios throughout their life cycle on a portfolio basis. When problem loans are identified that are secured with collateral, management examines the loan files to evaluate the nature and type of collateral supporting the loans. Management documents the collateral type, date of the most recent valuation, and whether any liens exist, to determine the value to compare against the committed loan amount.For retail installment contracts and personal unsecured loans, the Company estimates the allowance for loan losses at a level considered adequate to cover probable credit losses inherent in the portfolio. Probable losses are estimated based on contractual delinquency status and historical loss experience, in addition to the Company’s judgment of estimates of the value of the underlying collateral, bankruptcy trends, economic conditions such as unemployment rates, changes in the used vehicle value index, delinquency status, historical collection rates and other information in order to make the necessary judgments as to probable loan losses.NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)When the Company determines that the value of an impaired loan is less than its carrying amount, the Company recognizes impairment through a provision estimate or a charge-off to the allowance. Management performs these assessments on at least a quarterly basis. For the commercial loan portfolio segment, a charge-off is recorded when a loan, or a portion thereof, is considered uncollectible and of such little value that its continuance on the Company's books as an asset is not warranted, as required by accounting and regulatory guidance. Charge-offs are recorded on a monthly basis and partially charged-off loans continue to be evaluated on not less than a quarterly basis, with additional charge-offs or loan loss provisions taken on the remaining loan balance, if warranted, utilizing the same criteria.Consumer loans (excluding auto loans and credit cards) and any portion of a consumer loan secured by a real estate mortgage not adequately secured are generally charged-off when deemed to be uncollectible or delinquent 180 days or more (120 days for closed-end consumer loans not secured by real estate), whichever comes first, unless it can be clearly demonstrated that repayment will occur regardless of the delinquency status. Factors that would demonstrate repayment include: a loan that is secured by collateral and is in the process of collection; a loan supported by a valid guarantee or insurance; or a loan supported by a valid claim against a solvent estate. Auto loans are charged off when an account becomes 121 days delinquent if the Company has not repossessed the related vehicle. The Company charges off accounts in repossession when the automobile is repossessed and legally available for disposition. Credit cards are charged off when they are 180 days delinquent or within 60 days after the receipt of notification of the cardholder’s death or bankruptcy. Retail installment contracts acquired individually are charged off when the account becomes 120 days past due if the Company has not repossessed the related vehicle. The Company charges off accounts in repossession when the automobile is repossessed and is legally available for disposition. A charge-off represents the difference between the estimated net sales proceeds and the outstanding amount of the delinquent contract. Accounts in repossession that have been charged off and are pending liquidation are removed from retail installment contracts and the related repossessed automobiles are included in other assets in the Company’s Condensed Consolidated Balance Sheets. Unsecured revolving and term loans are charged off when the account becomes 180 and 120 days past due, respectively. Within the consumer loan portfolio segment, for both residential and home equity loans, loss severity assumptions are incorporated into the loan loss reserve models to estimate loan balances that will ultimately charge off. These assumptions are based on recent loss experience for six loan-to-value bands within the portfolios. Current loan-to-value ratios are updated based on movements in the state-level Federal Housing Finance Agency House Pricing Indexes.Additionally, the Company reserves for certain incurred, but undetected, losses within the loan portfolio. This is due to several factors such as, but not limited to, inherent delays in obtaining information regarding a customer's financial condition or changes in its unique business conditions and the interpretation of economic trends. While this analysis is conducted at least quarterly, the Company has the ability to revise the allowance factors whenever necessary in order to address improving or deteriorating credit quality trends or specific risks associated with a loan pool classification.Regardless of the extent of the Company's analysis of customer performance, portfolio evaluations, trends or risk management processes established, a level of imprecision will always exist due to the judgmental nature of loan portfolio and/or individual loan evaluations. The Company maintains an unallocated allowance to recognize the existence of these exposures.In addition to the allowance for loan losses, management estimates probable losses related to unfunded lending commitments. Unfunded lending commitments for commercial customers are analyzed and segregated by risk according to the Company's internal risk rating scale. These risk classifications, in conjunction with an analysis of historical loss experience, current economic conditions and performance trends within specific portfolio segments, and any other pertinent information result in the estimation of the reserve for unfunded lending commitments. Additions to the reserve for unfunded lending commitments are made by charges to the Provision for credit losses, and this reserve is classified within Other liabilities on the Company's Condensed Consolidated Balance Sheets. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)Risk factors are continuously reviewed and revised by management when conditions warrant. A comprehensive analysis of the Allowance for credit losses is performed by the Company on a quarterly basis. In addition, a review of allowance levels based on nationally published statistics is conducted on at least an annual basis.The factors supporting the Allowance for credit losses do not diminish the fact that the entire Allowance for credit losses is available to absorb losses in the loan portfolio and related commitment portfolio, respectively. The Company's principal focus, therefore, is on the adequacy of the total Allowance for credit losses.The Allowance for credit losses is subject to review by banking regulators. The Company's primary bank regulators conduct examinations of the Allowance for credit losses and make assessments regarding its adequacy and the methodology employed in its determination. |
| Leases                                                                 | LeasesThe Company provides financing for various types of equipment, aircraft, energy and power systems, and automobiles through a variety of lease arrangements.Prior to the Change in Control, leased vehicles under operating leases were carried at amortized cost net of accumulated depreciation and any impairment charges and are presented as Leased Vehicles, net in the Company’s Condensed Consolidated Balance Sheets. As a result of the Change in Control, the assets acquired were adjusted to an estimated fair value. Leased vehicles purchased in connection with newly originated operating leases are recorded at amortized cost. The depreciation expense of the vehicles is recognized on a straight-line basis over the contractual term of the leases to the expected residual value. The expected residual value and, accordingly, the monthly depreciation expense may change throughout the term of the lease. The Company estimates expected residual values using independent data sources and internal statistical models that take into consideration economic conditions, current auction results, the Company’s remarketing abilities, and manufacturer vehicle and marketing programs. Lease payments due from customers are recorded as income within other non-interest income in the Company’s Condensed Consolidated Statement of Operations, unless and until a customer becomes more than 60 days delinquent, at which time the accrual of revenue is discontinued. The accrual is resumed and reinstated if a delinquent account subsequently becomes 60 days or less past due. Payments from the vehicle’s manufacturer under their subvention programs are recorded as reductions to the cost of the vehicle and are recognized as an adjustment to depreciation expense on a straight-line basis over the contractual term of the lease. The Company periodically evaluates its investment in operating leases for impairment if circumstances, such as a general decline in used vehicle values, indicate that impairment may exist.The Company’s investments in leases that are accounted for as direct financing leases are carried at the aggregate of lease payments plus estimated residual value of the leased property less unearned income and are reported as part of loans held for investment in the Company’s Condensed Consolidated Balance Sheets. Leveraged leases, a form of financing lease, are carried net of non-recourse debt. We recognize income over the term of the lease using the constant effective yield method. Under the accounting for impairment or disposal of long-lived assets, residual values of leased assets under operating leases are evaluated individually for impairment. When aggregate future cash flows from the operating lease, including the expected realizable fair value of the leased asset at the end of the lease, are less than the book value of the lease, an immediate impairment write-down is recognized if the difference is deemed not recoverable. Otherwise, reductions in the expected residual value result in additional depreciation of the leased asset over the remaining term of the lease. Upon disposition, a gain or loss is recorded for any difference between the net book value of the leased asset and the proceeds from the disposition of the asset, including any insurance proceeds. Gains or losses on the sale of leased assets are included in Miscellaneous income, while valuation adjustments on lease residuals are included in Other administrative expense.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Premises and Equipment                                                 | Premises and EquipmentPremises and equipment are carried at cost, less accumulated depreciation. Depreciation is calculated utilizing the straight-line method. Estimated useful lives are as follows:Office buildings 10 to 30 yearsLeasehold improvements(1) 10 to 30 yearsSoftware(2) 3 to 5 yearsFurniture, fixtures and equipment 3 to 10 yearsAutomobiles 5 years(1)Leasehold improvements are depreciated over the shorter of the useful lives of the assets or the remaining term of the leases. The useful life of the leasehold improvements may be extended beyond the base term of the lease contract when the lease contract includes renewal option period(s) that are reasonably assured of being exercised at the date the leasehold improvements are purchased. At no point does the depreciable life exceed the economic useful life of the leasehold improvement or the expected term of the lease contract.(2)Standard depreciable period for software is three years. However, for larger software implementation projects, a five-year period is utilized. During the second quarter of 2014, certain changes to the Company’s IT strategy resulted in the Company conducting an assessment of its capitalized costs related to internally developed software classified as held and used. As part of that assessment, the Company identified a number of assets it determined to have no future service potential as well as assets whose carrying values were not considered recoverable in accordance with applicable accounting standards. This assessment resulted in the Company recording an impairment charge of $97.5 million for the quarter ended June 30, 2014. Expenditures for maintenance and repairs are charged to Occupancy and equipment expense in the Condensed Consolidated Statement of Operations as incurred.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Cost and Equity Method Investments                                     | Cost and Equity Method Investments For investments in limited partnerships, limited liability companies and other investments that are not required to be consolidated, the Company uses either the equity method or the cost method of accounting. The Company uses the equity method for general and limited partnership ownership interests, limited liability companies and other unconsolidated equity investments in which the Company is considered to have significant influence over the operations of the investee. Under the equity method, the Company records the equity ownership share of net income or loss of the investee in "Income/ (expense) from equity method investments". The Company uses the cost method for all other investments. Under the cost method, there is no change to the cost basis unless there is an other-than-temporary decline in value or dividends are received. If the decline is determined to be other-than-temporary, the Company writes down the cost basis of the investment to a new cost basis that represents realizable value. The amount of the write-down is accounted for as a loss included in "Income/ (expense) from equity method investments". Distributions received from the income of an investee on cost method investments are included in "Income/ (expense) from equity method investments". Investments described above are included in the caption "Equity method investments" on the Condensed Consolidated Balance Sheet.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| Goodwill                                                               | GoodwillGoodwill is the excess of the purchase price over the fair value of the tangible and identifiable intangible assets and liabilities of companies acquired through business combinations accounted for under the acquisition method.   Goodwill and other indefinite-lived intangible assets are not amortized on a recurring basis, but rather are subject to periodic impairment testing. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)The Company conducts its evaluation of goodwill impairment at the reporting unit level on an annual basis during the fourth quarter, and more frequently if events or circumstances indicate that the carrying value of a reporting unit exceeds its fair value. A reporting unit is an operating segment or one level below. Under ASC 350, Intangibles - Goodwill and Other, an entity's goodwill impairment analysis is required to be completed in two steps unless the entity determines, based on certain qualitative factors, that it is more likely than not (that is, a likelihood of more than 50 percent) that the fair value of a reporting unit is greater than its carrying amount, including goodwill, in which case the two-step process may be bypassed. It is worth noting that an entity has an unconditional option to bypass the preceding qualitative assessment (often referred to as step 0) for any reporting unit in any period and proceed directly to the first step of the goodwill impairment test. The first step required by ASC 350 includes a comparison of the fair value of each reporting unit to its respective carrying amount, including its allocated goodwill. If the fair value of the reporting unit is in excess of the carrying value, the related goodwill is considered not to be impaired and no further analysis is necessary. If the carrying value of the reporting unit is higher than the fair value, there is an indication that impairment exists and a second step must be performed to measure the amount of impairment, if any, for that reporting unit. When required, the second step of testing involves calculating the implied fair value of each of the affected reporting units. The implied fair value of goodwill is determined in the same manner as the amount of goodwill that is recognized in a business combination, which is the excess of the fair value of the reporting unit determined in step one over the fair value of the net assets and identifiable intangibles as if the reporting unit were being acquired. If the implied fair value of goodwill is in excess of the reporting unit's allocated goodwill amount, then no impairment charge is required. If the amount of goodwill allocated to the reporting unit exceeds the implied fair value of the goodwill, an impairment charged is recognized for the excess. A recognized impairment charge cannot exceed the amount of goodwill allocated to a reporting unit and cannot subsequently be reversed even if the fair value of the reporting unit recovers. Goodwill impairment testing involves management judgment, requiring an assessment of whether the carrying value of the reporting unit can be supported by its fair value using widely accepted valuation techniques, such as the market approach (e.g., earnings and price-to-book value multiples of comparable public companies) and/or the income approach (e.g., discounted cash flow method). These fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the annual goodwill impairment test will prove to be accurate predictions in the future.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| Intangible Assets, excluding Goodwill                                  | Intangible Assets, excluding GoodwillThe Company's intangible assets consist of assets purchased or acquired through business combinations, including trade names, dealer networks, and core deposit intangibles. Certain intangible assets are amortized over their useful lives. The Company evaluates identifiable intangibles for impairment when an indicator of impairment exists, but not less than annually. Separable intangible assets that are not deemed to have an indefinite life continue to be amortized over their useful lives.Indefinite-lived intangible assets are not amortized on a recurring basis, but rather are subject to periodic impairment testing when an indicator of impairment exists, but not less than annually.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Mortgage Servicing Rights and Asset Securitizations                    | Asset Securitizations The Company has historically securitized multi-family and commercial real estate loans, mortgage loans, home equity and other consumer loans, as well as automotive floor plan receivables that it originated and/or purchased from certain other financial institutions. After receivables or loans are securitized, the Company continues to maintain account relationships with its customers. The Company may provide administrative, liquidity facilities and/or other services to the resulting securitization entities, and may continue to service the financial assets sold to the securitization entity.If the securitization transaction meets the accounting requirements for deconsolidation and sale treatment, the securitized receivables or loans are removed from the balance sheet and a net gain or loss is recognized in income at the time of sale and each subsequent sale. Net gains or losses resulting from securitizations are recorded in non-interest income.Mortgage Servicing Rights Effective January 1, 2012, the Company elected to measure its residential MSRs at fair value. This election was made to be consistent with the risk management strategy to hedge changes in the fair value of these assets. The fair value of residential MSRs is estimated by using a cash flow valuation model which calculates the present value of estimated future net servicing cash flows, taking into consideration actual and expected mortgage loan prepayment rates, discount rates, servicing costs, and other economic factors which are determined based on current market conditions. Assumptions incorporated into the residential MSRs valuation model reflect management's best estimate of factors that a market participant would use in valuing the residential MSRs. Although sales of residential MSRs do occur, residential MSRs do not trade in an active market with readily observable prices. As a benchmark for the reasonableness of the residential MSRs fair value, opinions of value from independent parties (“Brokers”) are obtained. Brokers provide a range of values based upon their own discounted cash flow calculations of our portfolio that reflect conditions in the secondary market and any recently executed servicing transactions. Management compares the internally-developed residential MSR values to the ranges of values received from Brokers. If the residential MSRs fair value falls outside of the Brokers' ranges, management will assess whether a valuation adjustment is warranted. The residential MSRs value is considered to represent a reasonable estimate of fair value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Bank Owned Life Insurance                                              | Bank Owned Life Insurance BOLI represents the cash surrender value of life insurance policies for certain current and former employees who have provided positive consent to allow the Bank to be the beneficiary of such policies. Increases in the net cash surrender value of the policies, as well as insurance proceeds received, are recorded in non-interest income, and are not subject to income taxes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Other Real Estate Owned and Other Repossessed Assets                   | Other Real Estate Owned and Other Repossessed AssetsOREO and other repossessed assets consist of properties and other assets acquired by, or in lieu of, foreclosure in partial or total satisfaction of non-performing loans. Assets obtained in satisfaction of a loan are recorded at the estimated fair value minus estimated costs to sell based upon the property's appraisal value at the date of transfer. The excess of the carrying value of the loan over the fair value of the property minus estimated costs to sell are charged to the allowance for loan losses at the initial measurement date. Subsequent to the acquisition date, OREO is carried at the lower of cost or fair value less estimated cost to sell. Any declines in the fair value of OREO below the initial cost basis are recorded through a valuation allowance with a charge to non-interest income. Increases in the fair value of the OREO net of estimated selling costs will reverse the valuation allowance, but only up to the cost basis which was established at the initial measurement date. Costs of holding the property are recorded as operating expenses, except for significant property improvements, which are capitalized to the extent that the carrying value does not exceed the estimated fair value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Derivative Instruments and Hedging Activities                          | Derivative Instruments and Hedging Activities The Company uses derivative financial instruments primarily to help manage exposure to interest rate, foreign exchange, equity, and credit risk. Derivative financial instruments are also used to reduce the effects that changes in interest rates may have on net income, fair value of assets and liabilities, and cash flows. The Company also enters into derivatives with customers to facilitate their risk management activities.Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset, liability or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. The Company formally documents the relationships of certain qualifying hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking each hedge transaction.NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)Fair value hedges that are highly effective are accounted for by recording the change in the fair value of the derivative instrument and the related hedged asset, liability or firm commitment on the Condensed Consolidated Balance Sheet, with the corresponding income or expense recorded in the Condensed Consolidated Statement of Operations. The adjustment to the hedged asset or liability is included in the basis of the hedged item, while the fair value of the derivative is recorded as an other asset or other liability. Actual cash receipts or payments and related amounts accrued during the period on derivatives included in a fair value hedge relationship are recorded as adjustments to the income or expense associated with the hedged asset or liability. Cash flow hedges that are highly effective are accounted for by recording the fair value of the derivative instrument on the Condensed Consolidated Balance Sheet as an asset or liability, with a corresponding charge or credit, net of tax, recorded in accumulated other comprehensive income within stockholder's equity in the accompanying Condensed Consolidated Balance Sheet. Amounts are reclassified from accumulated other comprehensive income to the Consolidated Statements of Operations in the period or periods the hedged transaction affects earnings. In the case in which certain cash flow hedging relationships have been terminated, the Company continues to defer the net gain or loss in accumulated other comprehensive income and reclassifies it into interest expense as the future cash flows occur, unless it becomes probable that the future cash flows will not occur. We discontinue hedge accounting when it is determined that the derivative no longer qualifies as an effective hedge; the derivative expires or is sold, terminated or exercised; the derivative is designated as a fair value or cash flow hedge; or, for a cash flow hedge, it is no longer probable that the forecasted transaction will occur by the end of the originally specified time period. If we determine that the derivative no longer qualifies as a fair value or cash flow hedge and hedge accounting is discontinued, the derivative will continue to be recorded on the balance sheet at its fair value, with changes in fair value included in current earnings. For a discontinued fair value hedge, the previously hedged item is no longer adjusted for changes in fair value.The portion of gains and losses on derivative instruments not considered highly effective in hedging the change in fair value or expected cash flows of the hedged item, or derivatives not designated in hedging relationships, are recognized immediately in the Condensed Consolidated Statement of Operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Income Taxes                                                           | Income Taxes The Company accounts for income taxes under the asset and liability method. Deferred taxes are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates that will apply to taxable income in the years in which those temporary differences are expected to reverse or be realized. The effect on deferred tax assets and liabilities of a change in tax rates is recognized as income or expense in the period that includes the enactment date. A valuation allowance will be established if the Company determines that it is more likely than not that a deferred tax asset will not be realized. This requires periodic reviews of the carrying amount of deferred tax assets and when the deferred tax assets will be realized in future periods. Consideration is given to all positive and negative evidence related to the realization of deferred tax assets. Items considered in this evaluation include historical financial performance, expectation of future earnings, the ability to carry back losses to recoup taxes previously paid, length of statutory carryforward periods, experience with operating loss and tax credit carryforwards not expiring unused, tax planning strategies and timing of reversals of temporary differences. Significant judgment is required in assessing future earnings trends and the timing of reversals of temporary differences. The Company's evaluation is based on current tax laws, as well as management's expectations of future performance.In establishing a provision for income tax expense, the Company must make judgments and interpretations about the application of inherently complex tax laws of the U.S. and its states and municipalities, as well as certain foreign countries. Actual income taxes paid may vary from estimates depending upon changes in income tax laws, actual results of operations, and the final audit of tax returns by taxing authorities. Tax assessments may arise several years after tax returns have been filed. The Company reviews its tax balances quarterly and, as new information becomes available, the balances are adjusted as appropriate. Interest and penalties on income tax payments are included within Income tax provision on the Consolidated Statements of Operations. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued)The Company recognizes in its financial statements tax benefits from tax positions when it is more likely than not the position will be sustained upon examination by tax authorities. Such tax positions are initially and subsequently measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon ultimate settlement with the tax authority, assuming full knowledge of the position and all relevant facts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| Stock-Based Compensation                                               | Stock-Based Compensation The Company, through Santander, sponsors stock plans under which incentive and non-qualified stock options and non-vested stock may be granted periodically to certain employees. The Company recognizes compensation expense related to stock options and non-vested stock awards based upon the fair value of the awards on the date of the grant, adjusted for expected forfeitures, which is charged to earnings over the requisite service period (e.g., vesting period). Additionally, the Company estimates the number of awards for which it is probable that service will be rendered and adjusts compensation cost accordingly. Estimated forfeitures are subsequently adjusted to reflect actual forfeitures. The Company has also assumed several other stock-based arrangements in connection with the Change in Control. The Company was required to recognize stock option awards that were outstanding as of the Change in Control date at fair value. The portion of the fair value measurement of the share-based payments that is attributable to pre-business combination service is recognized as non-controlling interest and the portion relating to any remaining post business combination service is recognized as stock compensation expense over the remaining vesting period of the awards in the Company’s post business combination financial statements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Recent Accounting Developments                                         | In July 2013, the FASB issued Accounting Standards Update ("ASU") 2013-11, an update to ASC 740, "Income Taxes." This ASU requires unrecognized tax benefits, or a portion of those benefits, to be presented in the statement of financial position as a reduction to a deferred tax asset for net operating loss carryforwards, similar tax losses, or tax credit carryforwards. The ASU includes an exception that, if the net operating loss carryforwards, similar tax losses, or tax credit carryforwards are not available to settle any additional income taxes that would result from the disallowance of a tax position at the reporting date or the tax law of the applicable jurisdiction does not require the entity to use them and the entity does not intend to use them, the unrecognized tax benefits for such purpose should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The provisions of this update were effective for the Company on January 1, 2014 and were applied prospectively. The implementation of this guidance did not have a significant impact on the Company's financial position or results of operations or disclosures. The Company's adoption of this ASU resulted in a $93.9 million reduction in deferred tax assets as of September 30, 2014.NOTE 2. RECENT ACCOUNTING DEVELOPMENTS (continued)In January 2014, the FASB issued ASU 2014-01, an update to ASC 323, "Investments - Equity Method and Joint Ventures." The amendments in the ASU allow an entity to make an accounting policy election to account for its investments in qualified affordable housing projects using the proportional amortization method, if certain conditions are met. Under this method, an investor amortizes the cost of its investments in proportion to the tax credits and other tax benefits received and present the amortization as a component of income tax expense. Additional disclosures were also set forth in this update. ASU 2014-01 is effective on a retrospective basis beginning on January 1, 2015, with early adoption permitted. The Company is currently evaluating whether it will adopt the provisions of ASU 2014-01. If adopted, the Company does not expect the adoption to have a significant impact on the Company's financial position, results of operations or disclosures.In January 2014, the FASB issued ASU 2014-04, an update to ASC 310, "Receivables." The ASU clarifies when an in-substance repossession or foreclosure occurs that would require the transfer of a mortgage loan to OREO in the statement of financial position. Under this ASU an in-substance repossession or foreclosure occurs when the creditor obtains legal title to the residential real estate property or the borrower conveys all interest in the residential real estate property to the creditor to satisfy the loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The new ASU is effective beginning on January 1, 2015, with early adoption permitted. Entities may elect to adopt the new ASU by either using a modified retrospective transition method or a prospective transition method. The Company is currently evaluating the impact of this ASU on its financial position, results of operations and disclosures.In May 2014, the FASB issued ASU 2014-09, which created ASC 606 "Revenue from Contracts with Customers," superseding the revenue recognition requirements in ASC 605. This ASU requires an entity to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendment includes a five-step process to assist an entity in achieving the main principle(s) of revenue recognition under ASC 605. The amendment will be effective for the Company for the first annual period ending after December 15, 2016, including interim periods within that reporting period, and should be applied retrospectively to each prior reporting period presented or as a cumulative effect adjustment as of the date of adoption. Early adoption of the guidance is not permitted. The Company is currently evaluating the impact of this ASU on its financial position, results of operations and disclosures.In June 2014, the FASB issued ASU 2014-11, an amendment to ASC 860 “Transfers and Servicing.” This ASU requires accounting changes for repurchase to maturity and repurchase financing transactions, respectively, which will be accounted for as a secured borrowing agreement on a prospective basis. The ASU also adds additional disclosure requirements related to these transactions. The amendment will be effective for the Company for the first annual period ending after December 15, 2014. The accounting changes for all transactions affected by this amendment will have the impact recorded as a cumulative-effect adjustment to retained earnings on the date of adoption. The Company has completed its evaluation and concluded that there is no current impact of this ASU on its financial position, results of operations and disclosures.Also in June 2014, the FASB issued ASU 2014-12, an amendment to ASC 718 “Compensation-Stock Compensation.” This ASU requires that a performance target that affects vesting, and could be achieved after the requisite service period, be treated as a performance condition. Application of existing guidance in ASC 718, as it relates to awards with performance conditions that affect vesting, should continue to be used to account for such awards. The amendment will be effective for the Company for the first reporting period ending after December 15, 2015. Adoption of this amendment should be applied on a prospective basis to awards that are granted or modified on or after the effective date. There also is an option to apply the amendments on a modified retrospective basis for performance targets outstanding on or after the beginning of the first annual period presented as of the adoption date. Early adoption is permitted. The Company is currently evaluating the impact of this ASU on its financial position, results of operations and disclosures.NOTE 2. RECENT ACCOUNTING DEVELOPMENTS (continued)In August 2014, the FASB issued ASU 2014-14, an amendment to ASC 310-40 “Receivables - Troubled Debt Restructurings by Creditors.” This ASU requires that a government-guaranteed mortgage loan be de-recognized, and that a separate other receivable be recognized, upon foreclosure if the three criteria identified in the ASU are met. Upon foreclosure and meeting the three criteria, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) that is expected to be recovered from the guarantor. The amendment will be effective for the Company for the first reporting period ending after December 15, 2014. Adoption of the amendment by the Company can be either on a prospective or modified retrospective basis. For the prospective basis, the amendment would be applied to foreclosures occurring after the effective date of the amendment. For the modified retrospective basis, the Company would book a cumulative-effect adjustment (reclassification to other receivables as stated in the amendment) as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The Company is currently evaluating the impact of this ASU on its financial position, results of operations and disclosures.In August 2014, the FASB also issued ASU 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. This ASU requires management to perform an assessment of going concern and provides specific guidance on when and how to assess or disclose going concern uncertainties. The new standard also defines terms used in the evaluation of going concern, such as "substantial doubt." Following application, the Company will be required to perform assessments at each annual and interim period, provide an assessment period of one year from the issuance date, and make disclosures in certain circumstances in which substantial doubt is identified. The amendment will be effective for the Company for the first reporting period ending after December 15, 2016. Earlier application is permitted. The Company does not expect this ASU to have an impact on its financial position, result of operations, or disclosures.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Commercial Lending Asset Quality Indicators                            | Commercial Lending Asset Quality IndicatorsCommercial credit quality disaggregated by class of financing receivables is summarized according to standard regulatory classifications as follows:PASS. Asset is well-protected by the current net worth and paying capacity of the obligor or guarantors, if any, or by the fair value less costs to acquire and sell any underlying collateral in a timely manner.SPECIAL MENTION. Asset has potential weaknesses that deserve management’s close attention, which, if left uncorrected, may result in deterioration of the repayment prospects for an asset at some future date. Special Mention assets are not adversely classified.SUBSTANDARD. Asset is inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. A well-defined weakness or weaknesses exist that jeopardize the liquidation of the debt. The loans are characterized by the distinct possibility that the Bank will sustain some loss if deficiencies are not corrected.DOUBTFUL. Exhibits the inherent weaknesses of a substandard credit. Additional characteristics exist that make collection or liquidation in full highly questionable and improbable, on the basis of currently known facts, conditions and values. Possibility of loss is extremely high, but because of certain important and reasonable specific pending factors which may work to the advantage and strengthening of the credit, an estimated loss cannot yet be determined.LOSS. Credit is considered uncollectible and of such little value that it does not warrant consideration as an active asset. There may be some recovery or salvage value, but there is doubt as to whether, how much or when the recovery would occur.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).
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| - Definition
Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.
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| - Definition
Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.
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| - Definition
Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).
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| - Definition
Disclosure of accounting policy for its derivative instruments and hedging activities.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for the equity method of accounting for investments in common stock or other interests including unconsolidated domestic subsidiaries, corporate joint ventures, noncontrolling interests in real estate ventures, limited partnerships, and limited liability companies. Additionally, this element describes the entity's application of the cost method to equity investments or other interests that are not consolidated or accounted for under the equity method of accounting. The disclosure provided may include how equity method or cost investments are assessed for impairment.
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| - Definition
Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity. Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities.
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| - Definition
Disclosure of accounting policy for those finance, loan and lease receivables classified as held for investment. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the allowance for loan and lease losses is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of commitment and other fees and loan origination costs (including, if applicable, how the entity accounts for fees and costs associated with credit cards that are either purchased or originated) (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status (for impaired loans, the policy for recognizing interest income on such loans, including how cash receipts are recorded) and (7) the treatment of foreclosures or repossessions.
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| - Definition
Disclosure of accounting policy for those finance, loan and lease receivables classified as held for sale. This disclosure may include how the entity determines when to classify a loan or receivable as held for sale, the basis at which such receivables are carried in the entity's statements of financial position, how such receivables are valued, the method used to determine the lower of cost or fair value (that is, on an aggregate or individual asset basis), the treatment of commitment and other fees and origination costs, and how transfers to and from the held for investment portfolio are accounted for.
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| - Definition
Disclosure of accounting policy for goodwill. This accounting policy also may address how an entity assesses and measures impairment of goodwill, how reporting units are determined, how goodwill is allocated to such units, and how the fair values of the reporting units are determined.
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| - Definition
Disclosure of accounting policy for intangible assets. This accounting policy may address both intangible assets subject to amortization and those that are not. The following also may be disclosed: (1) a description of intangible assets (2) the estimated useful lives of those assets (3) the amortization method used (4) how the entity assesses and measures impairment of such assets (5) how future cash flows are estimated (6) how the fair values of such asset are determined.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.
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| - Definition
Disclosure of accounting policy for estimating the allowance for losses on loans and lease receivables. The disclosure may include (a) how the entity determines each element of the allowance, (b) which loans are evaluated individually and which loans are evaluated as a group, (c) how the entity determines both the allocated and unallocated portions of the allowance, (d) how the entity determines the loss factors applied to graded loans in order to develop a general allowance, and (e) what self-correcting mechanism the entity uses to reduce differences between estimated and actual losses.
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| - Definition
Disclosure of accounting policy for recording, valuing, and reporting amounts due from lessees pursuant to contractual arrangements, which are secured, at a minimum, by the asset being rented, and in measuring certain revenues, expenses and gains and losses arising from creating, acquiring, collecting, terminating, modifying and holding lease agreements.
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| - Definition
Disclosure of the accounting policy for loan agreements whose terms have been modified because of the inability of the borrower for financial reasons to comply with the terms of the original loan agreement. A creditor discloses material facts pertaining to significant modifications.
+ References
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| - Definition
Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.
+ References
No definition available.
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| - Definition
Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments.
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| - Definition
Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.
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| - Definition
Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.
+ References
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| - Definition
Disclosure of accounting policy for reporting subsequent events.
+ References
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| - Definition
Disclosure of accounting policy for transfers and servicing financial assets, including securitization transactions as well as repurchase and resale agreements. This disclosure may include how the entity (1) determines whether a transaction is accounted for as a sale; (2) accounts for a sale transaction, including the initial and subsequent accounting for any interests that the entity obtains or continues to hold in the transaction, how such interests are valued, and the significant assumptions used in the valuation; (3) accounts for a transaction that does not qualify for sale treatment (that is, a financing); and (4) accounts for its servicing assets and liabilities ("servicing"), including how such servicing is measured initially and subsequently, and the methodology and significant assumptions used to value such servicing.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
+ References
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