| **FAIR VALUE (As Restated) (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands**                                                                                                                                                                                                                           | Jun. 30, 2015 | Dec. 31, 2014 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | $ 19,324,217  | $ 15,908,078 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               | 0             | 833,936 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 76,554,535    | 74,293,865 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 157,147       | 145,047 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 391,300       | 366,061 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 402,517       | 402,775 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | [1]           | 3,202,917     | 2,024,838 |
| Level 1 [Member]                                                                                                                                                                                                                                                                                                                |               |          |   |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               |               | 2,212,358     | 2,201,783 |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | 10,411        | 10,343 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               |          | 0 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 3,333         | 0 |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             |               | 0             | 0 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 |               | 3,202,917     | 2,024,838 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 0             | 0 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 0             | 0 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Deposits                                                                                                                                                                                                                                                                                                                        |               | 46,727,994    | 45,162,698 |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           |               | 0             | 0 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 0             | 0 |
| Level 2 [Member]                                                                                                                                                                                                                                                                                                                |               |          |   |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               |               | 0             | 0 |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | 17,774,323    | 14,630,092 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               |          | 833,936 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 91,274        | 101,218 |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             |               | 1,948,742     | 260,251 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 |               | 0             | 0 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 0             | 0 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 405,047       | 384,100 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Deposits                                                                                                                                                                                                                                                                                                                        |               | 7,916,367     | 7,344,649 |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           |               | 34,880,644    | 30,355,610 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 407,869       | 374,636 |
| Level 3 [Member]                                                                                                                                                                                                                                                                                                                |               |          |   |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               |               | 0             | 0 |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | 1,539,483     | 1,267,643 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               |          | 0 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 76,777,190    | 74,164,351 |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             |               | 0             | 0 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 |               | 0             | 0 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 157,147       | 145,047 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 1,903         | 3,070 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Deposits                                                                                                                                                                                                                                                                                                                        |               | 0             | 0 |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           |               | 9,972,337     | 9,792,327 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 59,495        | 49,248 |
| Carrying Value [Member]                                                                                                                                                                                                                                                                                                         |               |          |   |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               |               | 2,212,358     | 2,201,783 |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | 19,324,217    | 15,908,078 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               |          | 833,936 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 76,554,535    | 74,293,865 |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             |               | 1,886,090     | 260,252 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 |               | 3,202,917     | 2,024,838 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 157,147       | 145,047 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 406,950       | 387,170 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Deposits                                                                                                                                                                                                                                                                                                                        |               | 54,622,913    | 52,474,007 |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           |               | 44,403,556    | 39,679,382 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 467,364       | 423,884 |
| Fair Value [Member]                                                                                                                                                                                                                                                                                                             |               |          |   |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |               |          |   |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               |               | 2,212,358     | 2,201,783 |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        |               | 19,324,217    | 15,908,078 |
| Trading securities                                                                                                                                                                                                                                                                                                              |               |          | 833,936 |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  |               | 76,871,797    | 74,265,569 |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             |               | 1,948,742     | 260,251 |
| Restricted cash                                                                                                                                                                                                                                                                                                                 |               | 3,202,917     | 2,024,838 |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       |               | 157,147       | 145,047 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | 406,950       | 387,170 |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |               |          |   |
| Deposits                                                                                                                                                                                                                                                                                                                        |               | 54,644,361    | 52,507,347 |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           |               | 44,852,981    | 40,147,937 |
| Derivatives                                                                                                                                                                                                                                                                                                                     |               | $ 467,364     | $ 423,884 |
|                                                                                                                                                                                                                                                                                                                                 |
| [1]The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. The Company consolidates VIEs where it is deemed the primary beneficiary. See Note 7 to these Condensed Consolidated Financial Statements for additional information. |

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| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
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| - Definition
Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| - Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.
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| - Definition
Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
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| - Definition
Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
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| - Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.
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| - Definition
Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.
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| - Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.
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