| **INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands** | Dec. 31, 2015 | Dec. 31, 2014 |
|-------------------------------------------------------------------------------------------|---------------|---------------|
| **Income Tax Disclosure [Abstract]**                                                      |          |          |
| Allowance for loan and lease losses                                                       | $ 237,574     | $ 244,764     |
| IRC Section 475 mark to market adjustment                                                 | 553,586       | 616,798       |
| Unrealized loss on available-for-sale securities                                          | 62,113        | 35,232        |
| Unrealized loss on derivatives                                                            | 5,692         | 9,816         |
| Capital loss carryforwards                                                                | 38,276        | 27,150        |
| Net operating loss carry forwards                                                         | 814,473       | 576,007       |
| Non-solicitation payments                                                                 | 952           | 5,610         |
| Employee benefits                                                                         | 142,016       | 104,234       |
| General business credit & other tax credit carry forwards                             | 478,792       | 423,695       |
| Foreign tax credit carry forwards                                                         | 0             | 7,870         |
| Broker commissions paid on originated mortgage loans                                      | 19,375        | 22,078        |
| Minimum tax credit carry forwards                                                         | 158,448       | 153,748       |
| Recourse reserves                                                                         | 11,990        | 25,725        |
| Deferred interest expense                                                                 | 77,517        | 78,264        |
| Other                                                                                     | 78,419        | 107,742       |
| Total gross deferred tax assets                                                           | 2,679,223     | 2,438,733     |
| Valuation allowance                                                                       | (64,928)      | (87,929)      |
| Total deferred tax assets                                                                 | 2,614,295     | 2,350,804     |
| Purchase accounting adjustments                                                           | 109,590       | 277,113       |
| Deferred income                                                                           | 17,257        | 20,506        |
| Originated mortgage servicing rights                                                      | 57,679        | 46,155        |
| Change in Control deferred gain                                                           | 381,068       | 1,350,597     |
| Leasing transactions                                                                      | 1,966,197     | 1,386,022     |
| Depreciation and amortization                                                             | 357,689       | 424,340       |
| Other                                                                                     | 49,082        | 13,152        |
| Total gross deferred tax liabilities                                                      | 2,938,562     | 3,517,885     |
| Net deferred tax (liability)                                                              | $ (324,267)   | $ (1,167,081) |

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Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.
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