CONSOLIDATED STATEMENTS OF OPERATIONS - Entity [Domain] - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Interest Expense Abstract
Provision for loan losses			$ 116,269,000	$ 134,750,000
Adjustments (expense) to indemnity reserves on loans sold			(4,107,000)	(17,801,000)
Noninterest Expense Abstract
Amortization of intangibles			4,985,000	5,007,000
Restructuring Charges					$ 26,700,000
Net (Loss) Income	$ 597,452,000	$ (511,314,000)	672,278,000	(424,905,000)
Net Income (Loss) Applicable to Common Stock	$ 596,521,000	$ (512,245,000)	$ 670,417,000	$ (426,767,000)
Net (Loss) Income per Common Share - Basic	$ 5.8	$ (4.98)	$ 6.52	$ (4.15)
Net (Loss) Income per Common Share - Diluted	$ 5.79	$ (4.98)	$ 6.5	$ (4.15)
Restructuring Charges Member
Noninterest Expense Abstract
Personnel costs	$ 2,866,000		$ 12,232,000
Net occupancy expenses	2,660,000		3,046,000
Equipment Expense	66,000		224,000
Professional fees	315,000		781,000
Other operating expenses	267,000		644,000
Segment, Continuing Operations [Member]
Interest income:
Loans	374,133,000	$ 380,986,000	729,764,000	$ 758,588,000
Money market investments	1,845,000	1,131,000	3,291,000	2,104,000
Investment securities	31,297,000	33,989,000	61,598,000	69,116,000
Trading account securities	3,026,000	5,344,000	5,722,000	10,601,000
Total interest income	410,301,000	421,450,000	800,375,000	840,409,000
Interest Expense Abstract
Deposits	26,258,000	26,223,000	52,122,000	53,081,000
Short-term borrowings	1,863,000	8,892,000	3,597,000	17,932,000
Long-term debt	19,627,000	445,716,000	38,908,000	477,606,000
Total interest expense	47,748,000	480,831,000	94,627,000	548,619,000
Net interest income	362,553,000	(59,381,000)	705,748,000	291,790,000
Net interest income after provision for loan losses	286,319,000	(121,059,000)	589,479,000	150,276,000
Service charges on deposit accounts	40,138,000	39,237,000	79,155,000	78,596,000
Other service fees	59,421,000	56,468,000	113,047,000	109,286,000
Mortgage banking activities	21,325,000	3,788,000	34,177,000	7,466,000
Net Gain Loss And Valuation Adjustments On Investment Securities	5,000	0	5,000	0
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net	(14,445,000)	0	(14,445,000)	0
Trading Gains (Losses)	(3,108,000)	1,055,000	(2,694,000)	3,032,000
Gain Loss On Sales Of Loans Net	681,000	9,659,000	602,000	14,052,000
Adjustments (expense) to indemnity reserves on loans sold	419,000	(7,454,000)	(4,107,000)	(17,801,000)
FDIC loss share (expense) income	19,075,000	(55,261,000)	23,214,000	(79,467,000)
Other operating income	17,248,000	15,297,000	27,040,000	43,657,000
Total non-interest income	140,759,000	62,789,000	255,994,000	158,821,000
Noninterest Expense Abstract
Personnel costs	120,977,000	99,100,000	237,435,000	203,401,000
Net occupancy expenses	23,286,000	20,267,000	44,995,000	41,627,000
Equipment Expense	15,925,000	12,044,000	29,336,000	23,456,000
Other taxes	11,113,000	13,543,000	19,687,000	27,206,000
Professional fees	78,449,000	67,024,000	153,977,000	134,023,000
Communication	6,153,000	6,425,000	12,329,000	13,110,000
Business promotion	13,776,000	16,038,000	24,589,000	27,424,000
FDIC deposit insurance	8,542,000	10,480,000	14,940,000	21,458,000
Other real estate owned (O R E O) expenses	44,816,000	3,410,000	67,885,000	9,850,000
Other operating expenses	31,082,000	20,509,000	48,430,000	42,858,000
Amortization of intangibles	2,881,000	2,025,000	4,985,000	4,051,000
Total operating expenses	363,174,000	275,439,000	675,515,000	553,038,000
Income (loss) from continuing operations before income tax	63,904,000	(333,709,000)	169,958,000	(243,941,000)
Income Tax Expense Benefit	(533,533,000)	(4,124,000)	(500,964,000)	19,140,000
Income (loss) from continuing operations	597,437,000	(329,585,000)	670,922,000	(263,081,000)
Net (Loss) Income	$ 597,437,000	$ (329,585,000)	$ 670,922,000	$ (263,081,000)
Net (loss) income from continuing operations - Basic	$ 5.8	$ (3.21)	$ 6.51	$ (2.58)
Net (loss) income from continuing operations - Diluted	$ 5.79	$ (3.21)	$ 6.49	$ (2.58)
Segment, Continuing Operations [Member] | Restructuring Charges Member
Noninterest Expense Abstract
Restructuring Charges	$ 6,174,000	$ 4,574,000	$ 16,927,000	$ 4,574,000
Segment, Continuing Operations [Member] | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	60,468,000	50,074,000	90,179,000	104,196,000
Segment, Continuing Operations [Member] | Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	15,766,000	11,604,000	26,090,000	37,318,000
Segment, Discontinued Operations [Member]
Interest Expense Abstract
Net interest income	0	19,092,000	0	40,889,000
Provision for loan losses	0	0	0	(6,764,000)
Other operating income	0	9,388,000,000	0	19,921,000,000
Total non-interest income	0	9,388,000,000	0	19,921,000,000
Noninterest Expense Abstract
Personnel costs	(9,000)	12,117,000	(9,000)	20,969,000
Net occupancy expenses	0	2,845,000	0	7,176,000
Professional fees	(7,000)	5,903,000	(1,348,000)	8,696,000
Other operating expenses	1,000	2,833,000	1,000	6,046,000
Total operating expenses	(15,000)	210,209,000	(1,356,000)	229,398,000
Income Loss From Discontinued Operations Net Of Tax	$ 15,000	$ (181,729,000)	$ 1,356,000	$ (161,824,000)
Net (loss) income from discontinued operations - Basic	$ 0	$ (1.77)	$ 0.01	$ (1.57)
Net loss (income) from discontinued operations - Diluted	$ 0	$ (1.77)	$ 0.01	$ (1.57)