| **Summary of Significant Accounting Plicies and Nature of Operations (Policies)**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| Basis of Presentation                                                               | Basis of PresentationThe accounting and reporting policies of FNB are in accordance with U.S. generally accepted accounting principles (“GAAP”). All significant intercompany balances and transactions have been eliminated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Use of Estimates                                                                    | Use of EstimatesWe have made a number of estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period to prepare these consolidated financial statements in conformity with GAAP. Actual results could differ from those estimates. Material estimates subject to change in the near term include, among other items, the allowances for loan losses (“ALL”), the carrying value of other real estate owned (“OREO”), the carrying value of intangible assets, the fair value of net assets acquired in the Merger and the realization of deferred tax assets.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Reclassification                                                                    | ReclassificationCertain reclassifications have been made to the prior period consolidated financial statements to place them on a comparable basis with the current period consolidated financial statements. These reclassifications have no effect on net income or shareholders’ equity as previously reported.During the first quarter of 2012, FNB implemented a purchased impaired loan accounting system and finalized its methodology to allocate the fair value of acquired loans in pools to individual loans for purposes of several of the loan disclosure tables in Notes 7 to the consolidated financial statements.  In order to present these tables for prior periods on a comparable basis to current period tables in these consolidated financial statements, we have reclassified certain amounts as of December 31, 2011 in the tables between loan portfolio segments and classes, between performing and impaired acquired loans, and between risk grade categories.  These reclassifications have no effect on net income, the loan fair value mark, total loans or shareholders' equity as of or for the period ended December 31, 2011.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Business Combinations                                                               | Business CombinationsBusiness combinations are accounted for under the acquisition method of accounting in accordance with Accounting Standards Codification (“ASC”) 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes 100% of the acquired assets and assumed liabilities, regardless of the percentage owned, at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including other identifiable assets, exceed the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies must also be recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the statement of operations from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Business Segments                                                                   | Business SegmentsWe report business segments in accordance with regulatory guidelines. Business segments are components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. The guidelines require that a public enterprise report a measure of segment profit or loss, certain specific revenue and expense items, segment assets, information about the way that the business segments were determined and other items. We have only one business segment.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| Cash and Cash Equivalents                                                           | Cash and Cash EquivalentsFor purposes of reporting cash flows, cash and cash equivalents include the balance sheet captions: cash and due from banks, and interest-bearing bank balances.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Investment Securities                                                               | Investment SecuritiesInvestment securities are categorized and accounted for as follows:•Available-for-sale securities - Debt and equity securities not classified as either held-to-maturity securities or trading securities are reported at fair value, with unrealized gains and losses, net of related tax effect, included as an item of accumulated other comprehensive income and reported as a separate component of shareholders’ equity.•Held-to-maturity securities - Debt securities that FNB has the positive intent and ability to hold to maturity are reported at amortized cost.We intend to hold securities classified as available-for-sale securities for an indefinite period of time but may sell them prior to maturity. All other securities, which FNB has the positive intent and ability to hold to maturity, are classified as held-to-maturity securities. FNB reclassified the held-to-maturity securities portfolio to available-for-sale on May 3, 2010 in order to provide additional liquidity to CommunityOne. At December 31, 2012 and December 31, 2011, respectively, we have no securities in the held-to-maturity portfolio.A decline, which is deemed to be other than temporary, in the market value of any available-for-sale or held-to-maturity equity security to a level below cost results in a reduction in carrying amount to fair value. The impairment is charged to earnings and a new cost basis for the security is established.Our policy regarding other than temporary impairment of investment securities (“OTTI”) requires continuous monitoring of those securities. The evaluation includes an assessment of both qualitative and quantitative measures to determine whether, in management’s judgment, the investment is likely to recover its original value. If the evaluation concludes that the investment is not likely to recover its original value, the unrealized loss is reported as an OTTI, and the loss is recorded as a securities transaction on the Consolidated Statements of Operations.For debt securities, an impairment loss is recognized in earnings only when (1) we intend to sell the debt security; (2) it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis; or (3) we do not expect to recover the entire amortized cost basis of the security. In situations where we intend to sell or when it is more likely than not that we will be required to sell the security, the entire impairment loss must be recognized in earnings. In all other situations, only the portion of the impairment loss representing the credit loss must be recognized in earnings, with the remaining portion being recognized in shareholders’ equity as a component of other comprehensive loss, net of deferred taxes.Interest income on debt securities is adjusted using the level yield method for the amortization of premiums and accretion of discounts. The adjusted cost of the specific security is used to compute gains or losses on the disposition of securities on a trade date basis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| Loans Held for Sale                                                                 | Loans Held for SaleFrom 2009 through the third quarter 2010, we originated residential mortgage loans, through our branch mortgage channel, under various loan programs which were sold in the secondary market. We re-entered that business in the second quarter of 2012. At December 31, 2012, loans held for sale consist of such residential mortgage loans which have not yet been sold. At December 31, 2011, loans held for sale represent problem commercial loans reclassified from loans held for investment that either are or were under contract to be sold. The loans held for sale are carried at the aggregate lower of cost or fair value less estimated costs to sell.Loans are generally sold without recourse. Gains or losses on loan sales are recognized at the time of sale, are determined by the difference between net sales proceeds and the carrying value of the loan sold, and are included in mortgage loan income.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| Loans Held for Investment                                                           | Loans Held for InvestmentLoans held for investment are stated at the principal amounts outstanding adjusted for purchase premiums/discounts, deferred net loan fees and costs, and unearned income.  FNB reports its loan portfolio by segment and classes, which are disaggregations of portfolio segments.  FNB's portfolio segments are:  Commercial and agricultural, Real estate, and Consumer loans.  The Commercial and agricultural loan and Consumer loan portfolios are not further segregated into classes.  The classes within the Real estate portfolio segment include Real estate - construction and Real estate mortgage, broken into 1-4 family residential mortgage and Commercial real estate mortgage loans. Loan fees and the incremental direct costs associated with making loans are deferred and subsequently recognized over the life of the loan as an adjustment of interest income. The premium or discount on purchased loans is amortized over the expected life of the loans and is included in interest and fees on loans.Loans that are less than 90 days delinquent may also be placed on nonaccrual, if approved, due to deterioration in the borrower’s financial condition that could result in less than full repayment.For all loan classes, a nonaccrual loan may be returned to accrual status when we can reasonably expect continued timely payments until payment in full. All prior arrearage does not have to be eliminated, nor do all previously charged-off amounts need to have been recovered, but the loan can still be returned to accrual status if the following conditions are met: (1) all principal and interest amounts contractually due (including arrearage) are reasonably assured of repayment within a reasonable period; and (2) there is a sustained period of repayment performance (generally a minimum of six months) by the borrower, in accordance with the contractual terms involving payments of cash or cash equivalents.At the time a loan is placed on nonaccrual, all accrued, unpaid interest is charged-off, unless it is documented that repayment of all principal and presently accrued but unpaid interest is probable. Charge-offs of accrued and unpaid interest are taken against the current year's interest income. They are not charged to the current ALL.For all classes within all loan portfolios, cash receipts received on nonaccrual loans are applied entirely against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income.Charge-off of Uncollectible Loans - For all loan classes, as soon as any loan becomes uncollectible, the loan will be charged down or charged off as follows:•If unsecured, the loan must be charged off in full.•If secured, the outstanding principal balance of the loan should be charged down to the net liquidation value of the collateral.Loans should be considered uncollectible when:•No regularly scheduled payment has been made within four months, or•The loan is unsecured, the borrower files for bankruptcy protection and there is no other (guarantor, etc.) support from an entity outside of the bankruptcy proceedings.Based on a variety of credit, collateral and documentation issues, loans with lesser degrees of delinquency or obvious loss may also be deemed uncollectible.Impaired Loans - An impaired loan is one for which FNB will not be repaid all principal and interest due per the terms of the original contract or within reasonably modified contracted terms. If the loan has been modified to provide relief to the borrower, the loan is deemed to be impaired if all principal and interest will not be repaid according to the original contract. All loans meeting the definition of Doubtful are considered impaired.When a loan in any class has been determined to be impaired, the amount of the impairment is measured using the present value of expected future cash flows discounted at the loan’s effective interest rate or, as a practical expedient, the observable market price of the loan, or the fair value of the collateral if the loan is collateral dependent. When the present value of expected future cash flows is used, the effective interest rate is the original contractual interest rate of the loan adjusted for any premium or discount. When the contractual interest rate is variable, the effective interest rate of the loan changes over time. A specific reserve is established as a component of the ALL when a loan has been determined to be impaired. After three months, specific reserves are considered for charge off. Subsequent to the initial measurement of impairment, if there is a significant change to the impaired loan’s expected future cash flows, or if actual cash flows are significantly different from the cash flows previously estimated, FNB recalculates the impairment and appropriately adjusts the specific reserve. Similarly, if FNB measures impairment based on the observable market price of an impaired loan or the fair value of the collateral of an impaired collateral-dependent loan, FNB will adjust the specific reserve if there is a significant change in either of those bases.When a loan within any class is impaired and principal and interest is in doubt when contractually due, interest income is not recognized. Cash receipts received on non-accruing impaired loans within any class are generally applied entirely against principal until the loan has been collected in full, after which time any additional cash receipts are recognized as interest income. Cash receipts received on accruing impaired loans within any class are applied in the same manner as accruing loans that are not considered impaired.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Acquired Loans                                                                      | Acquired LoansCertain performing loans acquired through business combinations that do not meet the specific criteria of ASC 310-30, but for which a discount is attributable at least in part to credit quality, are also accounted for under this guidance. As a result, related discounts are recognized subsequently through accretion based on the expected cash flow of the PC loans. The fair value of the loan is the present value of expected future cash flows at the acquisition date. The difference between the expected cash flows and the fair value is known as the accretable yield which is recognized as interest income over the remaining life of each PC loan when there is a reasonable expectation about the timing and amount of such cash flows.Loans are grouped together in pools according to similar risk characteristics, such as purpose and/or type of loan, and are treated in the aggregate for accounting purposes. Loans that meet the criteria for nonaccrual of interest at the time of acquisition may be considered performing upon and subsequent to acquisition, regardless of whether the customer is contractually delinquent, if the timing and expected cash flows on such loans can be reasonably estimated and if collection of the new carrying value of such loans is expected.Adjustments to loan values in future periods may occur based on management’s expectation of future cash flows over the lives of the PC loans.We have elected to account for the Granite portfolio under ASC 310-30, with the exception of performing revolving consumer and commercial loans, which are being accounted for under ASC 310-20.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| Allowance for Loan Losses                                                           | Allowance for Loan LossesThe ALL, which is utilized to absorb actual losses in the loan portfolio, is maintained at a level consistent with management’s best estimate of probable loan losses to be incurred as of the balance sheet date. FNB’s ALL is also assessed quarterly by management. This assessment includes a methodology that separates the total loan portfolio into homogeneous loan classifications for purposes of evaluating risk. The required allowance is calculated by applying a risk adjusted reserve requirement to the dollar volume of loans within a homogenous group, as determined by FNB's portfolio segments. Management also analyzes the loan portfolio on an ongoing basis to evaluate current risk levels, and risk grades are adjusted accordingly. While management uses the best information available to make evaluations, future adjustments may be necessary, if economic or other conditions differ substantially from the assumptions used.The reserve for unfunded commitments, which is included in other liabilities, is calculated by determining the unfunded commitment and multiplying that balance by the historical loss rate (including Q & E factors). The following describes our method for determining the unfunded commitment.:•Straight Lines of Credit:    Unfunded balance of line of credit•Revolving Lines of Credit:  Average Utilization (for last 12 months) less Current Utilization   •Letters of Credit –  a 10% utilization is appliedThe expected usage percentage is multiplied by the historical losses and Q&E factors for each loans pool as defined in the regular ALL calculation to determine the appropriate level of reserve. Historical Loss Rates: As of September 30, 2012, FNB has elected to change the method it uses to calculate the historical loss rates and qualitative and environmental factors in its ALL.  FNB had previously calculated the ALL using historical loss factors based on the risk-graded pool to which the loss was assigned at quarter-end four quarters prior to the loss. Historical loss rates are now calculated by associating losses to the risk-graded pool to which they relate for each of the previous eight quarters. Then, using a 25-quarter look back period, loss factors are calculated for each risk-graded pool. Q&E Loss Factors: The methodology incorporates various internal and external qualitative and environmental factors as described in the Interagency Policy Statement on the Allowance for Loan and Lease Losses dated December 2006. Input for these factors is determined on the basis of management observation, judgment, and experience. The factors utilized by FNB for all loan classes are as follows:a)Standard – Accounts for inherent uncertainty in using the past as a predictor of the future. Uniform across all segments.b)Volume – Accounts for historical growth characteristics of the portfolio over the loss recognition period.c)Terms – Measures risk derived from granting terms outside of policy and underwriting guidelines.d)Staff – Reflects staff competence in various types of lending.e)Delinquency – Reflects increased risk deriving from higher delinquency rates.f)Nonaccrual – Reflects increased risk of loans with characteristics that merit nonaccrual status.g)Migration – Accounts for the changing level of risk inherent in loans as they migrate into, or away from, more adverse risk grades.h)Concentration – Measures increased risk derived from concentration of credit exposure in particular industry segments within the portfolio.i)Production – Measures impact of growth and potential risk derived from new loan production.j)Process – Measures increased risk derived from more demanding processing requirements directed towards risk mitigation.k)Economic – Impact of general and local economic factors are the largest single factor affecting portfolio risk and effect is felt uniformly across pools.l)Competition – Measures risk associated with FNB's potential response to competitors’ relaxed credit requirements.m)Regulatory and Legal – Measures risk from exposure to regulations, legislation, and legal code that result in increased risk of loss.Each pool is assigned an adjustment to the potential loss percentage by assessing its characteristics against each of the factors listed above.Calculation and Summary: A general reserve amount for each loan pool is calculated by adding the historical loss rate to the total Q&E factors, and applying the combined percentage to the pool loan balances.Reserves are generally divided into three allocation segments:1.Individual Reserves. These are calculated against loans evaluated individually and deemed most likely to be impaired. Management determines which loans will be considered for potential impairment review. This does not mean that an individual reserve will necessarily be calculated for each loan considered for impairment, only for those noted during this process as likely to have a loss. Loans to be considered will generally include:•All commercial loans classified substandard or worse•Any other loan in a nonaccrual status•Any loan, consumer or commercial, that has already been modified such that it meets the definition of Troubled Debt Restructurings (“TDR”)•Any loan for which the customer has filed Bankruptcy when the customer does not reaffirm the debt.  The individual reserve must be verified at least quarterly, and recalculated whenever additional relevant information becomes available. All information related to the calculation of the individual reserve, including internal or external collateral valuations, assumptions, calculations, etc. must be documented. Individual reserve amounts are not carried indefinitely.•When the amount of the actual loss becomes reasonably quantifiable the amount of the loss should be charged off against the ALL, whether or not all liquidation and recovery efforts have been completed.•If the total amount of the individual reserve that will eventually be charged off cannot yet be determined, but some portion of the individual reserve can be viewed as an imminent loss, that smaller portion can be charged off against the ALL and the individual reserve reduced by a corresponding amount. It is acceptable to retain an estimate of remaining loss as a “special reserve” only when the estimate is not reasonably quantifiable.•Impaired loans with a de minimis balance are not individually evaluated for individual reserve but they are included in the formula reserve calculation.2.Formula Reserves. Formula reserves are held against loans evaluated collectively. Loans are grouped by type or by risk grade, or some combination of the two. Loss estimates are based on historical loss rates for each respective loan group.Formula reserves represent FNB’s best estimate of losses that may be inherent, or embedded, within the group of loans, even if it is not apparent at this time which loans within any group or pool represent those embedded losses.3.Unallocated Reserves. If individual reserves represent estimated losses tied to any specific loan, and formula reserves represent estimated losses tied to a pool of loans but not yet to any specific loan, then unallocated reserves represent an estimate of losses that are expected, but are not yet tied to any loan or group of loans. Unallocated reserves are generally the smallest of the three overall reserve segments and are set based on qualitative factors.All information related to the calculation of the three segments including data analysis, assumptions, calculations, etc. are documented. Assigning specific individual reserve amounts, formula reserve factors, or unallocated amounts based on unsupported assumptions or conclusions is not permitted.FNB lends primarily in North Carolina. As of December 31, 2012, a substantial majority of the principal amount of the loans held for investment in its portfolio was to businesses and individuals in North Carolina. This geographic concentration subjects the loan portfolio to the general economic conditions within this area. The risks created by this concentration have been considered by management in the determination of the adequacy of the ALL. Management believes the ALL is adequate to cover estimated losses on loans at each balance sheet date.In addition, as an integral part of the examination process, the OCC periodically reviews CommunityOne’s ALL and the FDIC reviews Granite’s ALL. The OCC or the FDIC may require CommunityOne or Granite, as the case may be, to recognize adjustments to the allowance based on its judgment about information available to it at the time of its examination. |
| Other Real Estate Owned                                                             | Other Real Estate OwnedOther real estate owned, or OREO, represents properties acquired through foreclosure or deed in lieu thereof. The property is classified as held for sale. The property is initially carried at fair value based on recent appraisals, less estimated costs to sell. Declines in the fair value of properties included in other real estate below carrying value are recognized by a charge to income.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Premises and Equipment                                                              | Premises and EquipmentPremises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows: buildings and improvements, 10 to 50 years, and furniture and equipment, 3 to 10 years. Leasehold improvements are amortized on a straight-line basis over the shorter of the estimated life of the improvement or the term of the lease.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Intangible Assets                                                                   | Intangible AssetsGoodwill arises from business combinations and represents the excess of the purchase price over the fair value of the net assets and other identifiable intangible assets acquired. Goodwill and other intangible assets deemed to have indefinite lives generated from purchase business combinations are not subject to amortization and are instead assessed for impairment no less than annually. Impairment exists when the carrying value of the goodwill exceeds its implied fair value. Impairment charges are included in noninterest expense in the statements of operations.Intangible assets with estimable useful lives are amortized over such useful lives to their estimated residual values. Core deposit intangible assets, which we refer to as CDI, is recognized apart from goodwill at the time of acquisition based on market valuations prepared by independent third parties. In preparing such valuations, the third parties consider variables such as deposit servicing costs, attrition rates, and market discount rates. CDI assets are amortized to expense over their useful lives, which we have estimated to range from 8 to 10 years. CDI is reviewed for impairment quarterly or earlier if events or changes in circumstances indicate that their carrying values may not be recoverable. If the recoverable amount of CDI is determined to be less than its carrying value, we would then measure the amount of impairment based on an estimate of the intangible asset's fair value at that time. If the fair value is below the carrying value, the intangible asset is reduced to such fair value and the impairment is recognized as noninterest expense in the statements of operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Mortgage Servicing Rights (“MSRs”)                                    | Mortgage Servicing Rights (“MSRs”)The rights to service mortgage loans for others are included in other assets on the consolidated balance sheet. MSRs are recorded at fair value on an ongoing basis, with changes in fair value recorded in the results of operations. A fair value analysis of MSRs is performed on a quarterly basis. In accordance with instructions from Fannie Mae, CommunityOne entered into an agreement on December 29, 2010 to sell mortgage servicing rights on approximately $492.9 million of loans serviced for Fannie Mae and recognized a loss of $3.0 million, including transaction costs. CommunityOne continued to service these loans until January 31, 2011. CommunityOne resumed the sale of mortgage loans to Fannie Mae  beginning in the second quarter of 2012, following Fannie Mae's approval of CommunityOne as a Seller Servicer.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Income Taxes                                                                        | Income TaxesIncome tax expense includes both a current provision based on the amounts computed for income tax return purposes and a deferred provision that results from application of the asset and liability method of accounting for deferred taxes. Under the asset and liability method, deferred tax assets and liabilities are established for the temporary differences between the financial reporting basis and the tax basis of FNB's assets and liabilities at enacted tax rates expected to be in effect when such amounts are realized or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date.Management’s determination of the realization of deferred tax assets is based upon its judgment of various future events and uncertainties, including the timing and amount of future income earned by certain subsidiaries and the implementation of various tax plans to maximize realization of the deferred tax assets. In evaluating the positive and negative evidence to support the realization of the asset under current guidance, given our current financial results and current economic conditions, there is insufficient positive evidence to support a conclusion that it is more likely than not this asset will be realized in the foreseeable future. Examinations of the income tax returns or changes in tax law may impact FNB’s tax liabilities and resulting provisions for income taxes.A valuation allowance is recognized for a deferred tax asset if, based on the weight of available evidence, it is more-likely-than-not that some portion or the entire deferred tax asset will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. In making such judgments, significant weight is given to evidence that can be objectively verified. As a result of the increased credit losses, FNB continues to be in a three-year cumulative pre-tax loss position as of December 31, 2012. A cumulative loss position is considered significant negative evidence in assessing the realizability of a deferred tax asset, which is difficult to overcome. FNB’s estimate of the realization of its deferred tax assets was based on the scheduled reversal of deferred tax liabilities and taxable income available in prior carry back years and estimated unrealized losses in the available-for-sale investment portfolio. FNB did not consider future taxable income in determining the realizability of its deferred tax assets. FNB expects its income tax expense (benefit) will be negligible for the next several quarters until profitability has been restored for a reasonable time and such profitability is considered sustainable. At that time, the valuation allowance would be reversed. Reversal of the valuation allowance requires a great deal of judgment and will be based on the circumstances that exist as of that future date. If future events differ significantly from FNB’s current forecasts, FNB may need to increase this valuation allowance, which could have a material adverse effect on the results of operations and financial condition. See also Note 11 for discussion of the impact on deferred taxes associated with the Merger.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| Earnings per Share (“EPS”)                                            | Earnings per Share (“EPS”)As required for entities with complex capital structures, a dual presentation of basic and diluted EPS is included on the face of the statements of operations, and a reconciliation is provided in a footnote of the numerator and denominator of the basic EPS computation to the numerator and denominator of the diluted EPS computation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Comprehensive Income                                                                | Comprehensive IncomeComprehensive income is defined as the change in equity of an enterprise during a period from transactions and other events and circumstances from non-owner sources and, accordingly, includes both net income and amounts referred to as other comprehensive income. The items of other comprehensive income are included in the consolidated statement of comprehensive loss. The accumulated balance of other comprehensive loss is included in the shareholders’ equity section of the consolidated balance sheet. FNB’s components of accumulated other comprehensive loss for each period presented include unrealized gains (losses) on investment securities classified as available-for-sale, and the effect of the defined benefit pension and other postretirement plans for employees.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Employee Benefit Plans                                                              | Employee Benefit PlansFNB has maintained a defined benefit pension plan. Pension costs, which are actuarially determined using the projected unit credit method, are charged to current operations. Pension costs of $0.4 million, $0.4 million, and  $0.6 million were recognized during 2012, 2011 and 2010, respectively. Annual funding contributions are made up to the maximum amounts allowable for Federal income tax purposes. See Note 14 “Employee Benefit Plans” for additional information on all benefit plans described below.The pension plan was frozen in 2006 and no additional employees are eligible to enter the plan. Employees who had obtained certain age and service qualifications continued to accrue benefits through December 31, 2010. Benefits are based on the employee’s compensation, years of service and age at retirement.FNB has maintained a noncontributory, nonqualified supplemental executive retirement plan (“SERP”), covering certain executive employees. Annual benefits payable under the SERP are based on factors similar to those for the pension plan, with offsets related to amounts payable under the pension plan and social security benefits. SERP costs, which are actuarially determined using the projected unit credit method and recorded on an unfunded basis, are charged to current operations and credited to a liability account on the consolidated balance sheet. In 2010, the Board of Directors approved an amendment to the plan which stopped additional benefit accrual under the SERP after December 31, 2010. This action did not impact a participant's vested or accrued benefit in the plan. In September 2012, the Board of Directors approved an amendment to terminate the Plan.  The amendment provides for lump sum cash distributions of participant benefits in accordance with Internal Revenue Code Section 409A.  These payments shall be made no earlier than one year after the termination date of the plan and no later than two years after plan termination.  Based on the decision to terminate the SERP by providing a lump sum settlement in 2013, a deferred gain of $0.4 million was recorded in other comprehensive income in 2012.  FNB has maintained a postretirement benefit plan, which provides medical and life insurance benefits to retirees who obtained certain age and service requirements. Postretirement benefit costs, which are actuarially determined using the attribution method and recorded on an unfunded basis, are charged to current operations and credited to a liability account on the consolidated balance sheet. In conjunction with the modified freeze of the pension plan, the postretirement medical and life insurance plan was also amended. Effective December 31, 2006, no new employees are eligible to enter the postretirement medical and life insurance plan. Employees who had obtained certain age and service qualifications continued to accrue benefits through December 31, 2010. Benefits are based on the employee's years of service at retirement. Only employees who qualified for continued benefit accrual are eligible for benefits under this plan.FNB has a matching retirement/savings plan which permits eligible employees to make contributions to the plan up to a specified percentage of compensation as defined by the plan. A portion of the employee contributions are matched by FNB based on the plan formula, which is $.50 for each dollar on the first 6% of eligible pay deferred by the employee under the plan. Additionally, commencing in 2007, FNB on a discretionary basis may make an annual contribution up to a specified percentage of compensation as defined by the plan to the account of each eligible employee. FNB did not make a discretionary contribution in 2012, 2011 or 2010. The matching and discretionary contributions amounted to $0.6 million in 2012, $0.4 million in 2011, and $0.5 million in 2010.Granite has sponsored a tax-qualified profit-sharing and savings retirement plan covering substantially all Granite employees. Contributions to the plan are made at the discretion of the Board of Directors but may not exceed the maximum amount allowable for federal income tax purposes. There were no Company contributions made for the years ended December 31, 2012 and 2011. The plan permits eligible employees to make contributions to the plan up to a specified percentage of compensation as defined by the plan. Effective January 1, 2012 the plan was amended to provide a match on a portion of the employee contributions. The match is based on the plan formula, which is $.50 for each dollar on the first 6% of eligible pay deferred by the employee under the plan. In July 2012, the Granite plan and the FNB plan were merged together into an amended and restated CommunityOne 401(k) plan.  Granite has also sponsored a non-tax qualified profit-sharing supplemental executive retirement plan for certain executive officers, which allowed Granite to supplement the level of the executive officers' retirement incomes over that which is obtainable through the tax-qualified profit-sharing retirement plan sponsored by Granite. There was no expense for the years ended December 31, 2012 and 2011.  The plan was terminated in October, 2011 and two remaining balances were paid out in 2012.  There are no future obligations under this plan.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Derivatives and Financial Instruments                                               | Derivatives and Financial InstrumentsA derivative is a financial instrument that derives its cash flows, and therefore its value, by reference to an underlying instrument, index or referenced interest rate. FNB uses derivatives primarily to manage interest rate risk related to mortgage servicing rights, and long-term debt. The fair value of derivatives in a gain or loss position is included in other assets or liabilities, respectively, on the Consolidated Statements of Operations.FNB classifies its derivative financial instruments as either a hedge of an exposure to changes in the fair value of a recorded asset or liability, or a fair value hedge, or a hedge of an exposure to changes in the cash flows of a recognized asset, liability or forecasted transaction, or a cash flow hedge. FNB has master netting agreements with the derivatives dealers with which it does business, but reflects gross gains and losses on the Consolidated Income Statements and Balance Sheets.FNB uses the long-haul method to assess hedge effectiveness. FNB documents, both at inception and over the life of the hedge, at least quarterly, its analysis of actual and expected hedge effectiveness. This analysis includes techniques such as regression analysis and hypothetical derivatives to demonstrate that the hedge has been, and is expected to be, highly effective in off-setting corresponding changes in the fair value or cash flows of the hedged item. For a qualifying fair value hedge, changes in the value of the derivatives that have been highly effective as hedges are recognized in current period earnings along with the corresponding changes in the fair value of the designated hedged item attributable to the risk being hedged. For a qualifying cash flow hedge, the portion of changes in the fair value of the derivatives that have been highly effective are recognized in other comprehensive income until the related cash flows from the hedged item are recognized in earnings.For either fair value hedges or cash flow hedges, ineffectiveness may be recognized in noninterest income to the extent that changes in the value of the derivative instruments do not perfectly offset changes in the value of the hedged items attributable to the risk being hedged. If the hedge ceases to be highly effective, FNB discontinues hedge accounting and recognizes the changes in fair value in current period earnings. If a derivative that qualifies as a fair value or cash flow hedge is terminated or the designation removed, the realized or then unrealized gain or loss is recognized into income over the original hedge period (fair value hedge) or period in which the hedged item affects earnings (cash flow hedge). Immediate recognition in earnings is required upon sale or extinguishment of the hedged item (fair value hedge) or if it is probable that the hedged cash flows will not occur (cash flow hedge).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Recent Accounting Pronouncements                                                    | Recent Accounting PronouncementsComprehensive Income - The Comprehensive Income topic of the ASC was amended in June 2011. The amendment eliminates the option to present other comprehensive income as a part of the statement of changes in stockholders’ equity and requires consecutive presentation of the statement of net income and other comprehensive income. The amendments became applicable to FNB on January 1, 2012 and were applied retrospectively. In December 2011, the topic was further amended to defer the effective date of presenting reclassification adjustments from other comprehensive income to net income on the face of the financial statements. Companies should continue to report reclassifications out of accumulated other comprehensive income consistent with the presentation requirements in effect prior to the amendments while FASB redeliberates future requirements. The remaining provisions of this update took effect for FNB on January 1, 2012, and FNB began to include Statements of Comprehensive Loss in its Forms 10-Q and 10-K.Goodwill - In September 2011, the Intangibles topic was again amended to permit an entity to consider qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. These amendments were effective for FNB on January 1, 2012, and had no impact on FNB's 2012 financial statements.Financial and Derivative Instruments - The Balance Sheet topic of the ASC was amended in December 2011 for companies with financial instruments and derivative instruments that offset or are subject to a master netting agreement. The amendments require disclosure of both gross information and net information about instruments and transactions eligible for offset or subject to an agreement similar to a master netting agreement. The amendments are effective for reporting periods beginning on or after January 1, 2013 and must be provided retrospectively for all comparative periods presented. FNB does not expect these amendments to have a material effect on its financial statements.Fair Value Measurements - The Fair Value Measurement topic of the ASC was amended in May 2011 to clarify the application of existing fair value measurement and disclosure requirements and by changing particular principles or requirements for measuring fair value or for disclosing information about fair value measurements.  The amendment was effective for FNB on January 1, 2012, and the related disclosures are presented in Note 20.FASB - From time to time, the Financial Accountings Standards Board (“FASB”) issues exposure drafts for proposed statements of financial accounting standards. Such exposure drafts are subject to comment from the public, to revisions by the FASB and to final issuance by the FASB as statements of financial accounting standards.Management considers the effect of the proposed statements on the consolidated financial statements of FNB and monitors the status of changes to and proposed effective dates of exposure drafts. Other accounting standards that have been issued or proposed by the FASB or other standards-setting bodies are not expected to have a material impact on FNB’s financial position, results of operations or cash flows.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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Acquired Loans, Policy [Policy Text Block]
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Mortgage Servicing Rights, Policy [Policy Text Block]
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Other Real Estate Owned, Policy [Policy Text Block]
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No definition available.
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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.
+ References
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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.
+ References
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| - Definition
Disclosure of accounting policy for comprehensive income.
+ References
No definition available.
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| - Definition
Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.
+ References
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| - Definition
Disclosure of accounting policy for its derivative instruments and hedging activities.
+ References
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| - Definition
Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.
+ References
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| - Definition
Disclosure of accounting policy for estimating its allowance for loan and lease losses, and any liability the entity has recorded for off-balance sheet credit losses. The disclosure identifies the factors that influenced management of the entity in establishing the level of the allowance (for example, historical losses and existing economic conditions) and also may include discussion of the risk elements relevant to particular categories of receivables. The disclosure may also include the basis for determining each element of the allowance for loan and lease losses.
+ References
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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 and intangible assets. This accounting policy also may address how an entity assesses and measures impairment of goodwill and intangible assets.
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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 the adoption of new accounting pronouncements that may impact the entity's financial reporting.
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No definition available.
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| - Definition
Disclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.
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| - Definition
Disclosure of accounting policy for reclassifications that affects the comparability of the financial statements.
+ References
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| - Definition
Disclosure of accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized.
+ References
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| - Definition
Disclosure of accounting policy for segment reporting.
+ References
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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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