| **INCOME TAXES (As Restated) (Tables)**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| **Income Tax Disclosure [Abstract]**               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule of Provision for Income Taxes             | The provision for income taxes in the Consolidated Statement of Operations is comprised of the following components:  YEAR ENDED DECEMBER 31,  2015 2014 2013  (in thousands)Current:      Foreign $26 $— $208Federal 114,675 (231,604) (79,282)State 38,396 (2,847) 5,099Total current 153,097 (234,451) (73,975)       Deferred:     Federal (759,487) 1,664,520 117,465State (68,848) 180,889 39,926Total deferred (828,335) 1,845,409 157,391Total income tax (benefit)/provision $(675,238) $1,610,958 $83,416                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Reconciliation of the U.S. Federal Statutory Rate  | The following is a reconciliation of the U.S. federal statutory rate of 35.0% to the Company's effective tax rate for each of the years indicated:  YEAR ENDED DECEMBER 31,  2015 2014 2013Federal income tax at statutory rate 35.0 % 35.0 % 35.0 %Increase/(decrease) in taxes resulting from:      Valuation allowance 0.4 % (0.1)% (0.1)%Tax-exempt income 0.5 % (0.7)% (4.3)%Bank owned life insurance 0.5 % (0.5)% (2.7)%State income taxes, net of federal tax benefit (1.6)% 0.9 % 4.8 %Investment tax credits(1) — % — % (2.3)%General business tax credits 0.3 % (0.3)% (2.7)%Electric vehicle credits 0.7 % (0.7)% — %Debt redemption — %  (7.8)%Basis in SC 25.5 % 2.3 % — %Dividend from SC — % — % (7.6)%Nondeductible goodwill impairment (43.8)% — % — %Uncertain tax position reserve (2.7)% (0.5)% 0.3 %Other 2.9 % 0.3 % (1.3)%Effective tax rate 17.7 % 35.7 % 11.3 %(1)  Investment tax credits in 2013 were the result of the Company's investment in a VIE.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of Deferred Tax Assets and Liabilities    | The tax effects of temporary differences that give rise to the deferred tax assets and deferred tax liabilities are presented below:   AT DECEMBER 31,  2015 2014  (in thousands)Deferred tax assets:    Allowance for loan and lease losses $237,574 $244,764IRC Section 475 mark to market adjustment 598,346 652,658Unrealized loss on available-for-sale securities 62,112 35,232Unrealized loss on derivatives 5,692 9,816Capital loss carryforwards 38,276 27,150Net operating loss carry forwards 781,186 565,698Non-solicitation payments 952 5,610Employee benefits 118,321 114,054General business credit & other tax credit carry forwards 479,380 424,284Foreign tax credit carry forwards — 7,870Broker commissions paid on originated mortgage loans 19,375 22,078Minimum tax credit carry forwards 159,430 154,729Recourse reserves 11,990 25,725Deferred interest expense 77,517 78,264Other 101,818 117,602Total gross deferred tax assets 2,691,969 2,485,534Valuation allowance (64,928) (87,929)Total deferred tax assets 2,627,041 2,397,605     Deferred tax liabilities:    Purchase accounting adjustments 167,488 316,472Deferred income 23,821 25,488Originated mortgage servicing rights 57,679 46,155Change in Control deferred gain 367,647 1,351,247Leasing transactions(1) 1,953,978 1,380,702Depreciation and amortization 360,716 424,358Other 49,081 13,154Total gross deferred tax liabilities 2,980,410 3,557,576     Net deferred tax (liability)  $(353,369) $(1,159,971)      (1)  Deferred tax liability related to leasing transactions is primarily the result of accelerated tax depreciation on leasing transactions. |
| Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:  Unrecognized Tax Benefits Accrued Interest and Penalties Total  (in thousands)Gross unrecognized tax benefits at January 1, 2013 $125,465 $23,023 $148,488Additions based on tax positions related to 2013 2,339 — 2,339Additions for tax positions of prior years — 936 936Gross unrecognized tax benefits at December 31, 2013 127,804 23,959 151,763Change in Control 1,487 746 2,233Additions based on tax positions related to 2014 2,681 — 2,681Additions for tax positions of prior years 34,536 3,845 38,381Reductions for tax positions of prior years (24,783) (6,351) (31,134)Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations (2,473) (927) (3,400)Settlements (2,514) (428) (2,942)Gross unrecognized tax benefits at December 31, 2014 136,738 20,844 157,582Additions based on tax positions related to the current year 633 — 633Additions for tax positions of prior years 103,063 2,994 106,057Reductions for tax positions of prior years (11) (9) (20)Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations (1,055) (156) (1,211)Gross unrecognized tax benefits at December 31, 2015 239,368 $23,673 263,041Gross net unrecognized tax benefits that if recognized would impact the effective tax rate at December 31, 2015 $239,368 $23,673         Less: Federal, state and local income tax benefits     (15,693)Net unrecognized tax benefit reserves     $247,348                                                                             |

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| - Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.
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| - Definition
Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.
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| - Definition
Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.
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| - Definition
Tabular disclosure of the change in unrecognized tax benefits.
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