Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	$ 0	$ 0
Loans	387,942	423,375
Money market investments	948	947
Investment securities	45,070	52,375
Trading account securities	5,891	8,754
Total interest income	439,851	485,451
Interest Expense Abstract
Deposits	51,679	76,879
Short-term borrowings	13,583	14,015
Interest Expense Long Term Debt	37,007	51,198
Total interest expense	102,269	142,092
Net interest income	337,582	343,359
Provision for loan losses	100,723	75,319
Net interest income after provision for loan losses	236,859	268,040
Fees And Commissions Depositor Accounts	46,589	45,630
Other service fees	66,039	58,652
Sale and valuation adjustments of investment securities	0	0
Trading account profit	(2,143)	(499)
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	15,471	7,244
Adjustments To Indemnity Reserves On Loans Sold	(3,875)	(9,848)
F D I C Loss Share Income	(15,255)	16,035
Fair value change in equity appreciation instrument	0	7,745
Noninterest Income Other Operating Income	17,082	39,409
Total non-interest income	123,908	164,368
Noninterest Expense Abstract
Labor And Related Expense	121,491	106,140
Occupancy Net	24,162	24,586
Equipment Expense	11,341	12,036
Taxes Other	13,438	11,972
Professional fees	48,105	46,688
Communication	7,131	7,210
Marketing And Advertising Expense	12,850	9,860
Federal Deposit Insurance Corporation Premium Expense	24,926	17,673
Loss on early extinguishment of debt	69	8,239
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	14,165	2,211
Other operating expenses	15,896	26,179
Amortization of intangibles	2,593	2,255
Total operating expenses	296,167	275,049
Income (loss) before income tax	64,600	157,359
Income tax expense	16,192	147,227
Equity in undistributed earnings (losses) of subsidiaries	0	0
Net Income (Loss) Attributable to Parent	48,408	10,132
Comprehensive Income Net Of Tax	47,171	3,091
Parent Company [Member]
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0
Loans	1,691	3,020
Money market investments	12	0
Investment securities	4,042	4,130
Trading account securities	0	0
Total interest income	5,745	7,150
Interest Expense Abstract
Deposits	0	0
Short-term borrowings	0	22
Interest Expense Long Term Debt	23,527	25,548
Total interest expense	23,527	25,570
Net interest income	(17,782)	(18,420)
Provision for loan losses	140	0
Net interest income after provision for loan losses	(17,922)	(18,420)
Fees And Commissions Depositor Accounts	0	0
Other service fees	0	0
Sale and valuation adjustments of investment securities	0	0
Trading account profit	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0
F D I C Loss Share Income	0	0
Fair value change in equity appreciation instrument	0	0
Gain on sale of processing and technology business		0
Noninterest Income Other Operating Income	2,952	18,185
Total non-interest income	2,952	18,185
Noninterest Expense Abstract
Labor And Related Expense	7,904	6,856
Occupancy Net	861	806
Equipment Expense	880	772
Taxes Other	713	330
Professional fees	1,991	2,826
Communication	133	122
Marketing And Advertising Expense	411	423
Federal Deposit Insurance Corporation Premium Expense	0	0
Loss on early extinguishment of debt	0	8,000
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0
Other operating expenses	(12,280)	(11,481)
Amortization of intangibles	0	0
Total operating expenses	613	8,654
Income (loss) before income tax	(15,583)	(8,889)
Income tax expense	672	2,026
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	(16,255)	(10,915)
Equity in undistributed earnings (losses) of subsidiaries	64,663	21,047
Net Income (Loss) Attributable to Parent	48,408	10,132
Comprehensive Income Net Of Tax	47,171	3,091
Guarantor Subsidiaries Member
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0
Loans	0	16
Money market investments	20	16
Investment securities	4	7
Trading account securities	0	0
Total interest income	24	39
Interest Expense Abstract
Deposits	0	0
Short-term borrowings	0	0
Interest Expense Long Term Debt	0	0
Total interest expense	0	0
Net interest income	24	39
Provision for loan losses	0	0
Net interest income after provision for loan losses	24	39
Fees And Commissions Depositor Accounts	0	0
Other service fees	0	0
Sale and valuation adjustments of investment securities	0	0
Trading account profit	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0
F D I C Loss Share Income	0	0
Fair value change in equity appreciation instrument	0	0
Gain on sale of processing and technology business		0
Noninterest Income Other Operating Income	6,109	19,944
Total non-interest income	6,109	19,944
Noninterest Expense Abstract
Labor And Related Expense	150	84
Occupancy Net	8	8
Equipment Expense	0	2
Taxes Other	0	0
Professional fees	40	25
Communication	0	5
Marketing And Advertising Expense	0	0
Federal Deposit Insurance Corporation Premium Expense	0	0
Loss on early extinguishment of debt	0	0
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0
Other operating expenses	(4,399)	8,468
Amortization of intangibles	0	0
Total operating expenses	(4,201)	8,592
Income (loss) before income tax	10,334	11,391
Income tax expense	(393)	3,462
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	10,727	7,929
Equity in undistributed earnings (losses) of subsidiaries	(3,141)	16,665
Net Income (Loss) Attributable to Parent	7,586	24,594
Comprehensive Income Net Of Tax	(49,397)	31,344
Non Guarantor Subsidiaries Member
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0
Loans	0	0
Money market investments	8	1
Investment securities	81	81
Trading account securities	0	0
Total interest income	89	82
Interest Expense Abstract
Deposits	0	0
Short-term borrowings	143	314
Interest Expense Long Term Debt	8,077	7,600
Total interest expense	8,220	7,914
Net interest income	(8,131)	(7,832)
Provision for loan losses	0	0
Net interest income after provision for loan losses	(8,131)	(7,832)
Fees And Commissions Depositor Accounts	0	0
Other service fees	0	0
Sale and valuation adjustments of investment securities	0	0
Trading account profit	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0
F D I C Loss Share Income	0	0
Fair value change in equity appreciation instrument	0	0
Gain on sale of processing and technology business		0
Noninterest Income Other Operating Income	(169)	1,696
Total non-interest income	(169)	1,696
Noninterest Expense Abstract
Labor And Related Expense	0	0
Occupancy Net	1	1
Equipment Expense	0	0
Taxes Other	0	0
Professional fees	3	2
Communication	0	5
Marketing And Advertising Expense	0	0
Federal Deposit Insurance Corporation Premium Expense	0	0
Loss on early extinguishment of debt	0	0
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0
Other operating expenses	110	110
Amortization of intangibles	0	0
Total operating expenses	114	118
Income (loss) before income tax	(8,414)	(6,254)
Income tax expense	0	(264)
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	(8,414)	(5,990)
Equity in undistributed earnings (losses) of subsidiaries	6,006	21,399
Net Income (Loss) Attributable to Parent	(2,408)	15,409
Comprehensive Income Net Of Tax	(2,088)	12,632
Other Subsidiaries [Member]
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0
Loans	387,548	422,726
Money market investments	946	969
Investment securities	44,164	51,379
Trading account securities	5,891	8,754
Total interest income	438,549	483,828
Interest Expense Abstract
Deposits	51,760	77,040
Short-term borrowings	14,292	15,556
Interest Expense Long Term Debt	8,367	20,978
Total interest expense	74,419	113,574
Net interest income	364,130	370,254
Provision for loan losses	100,583	75,319
Net interest income after provision for loan losses	263,547	294,935
Fees And Commissions Depositor Accounts	46,589	45,630
Other service fees	68,962	62,040
Sale and valuation adjustments of investment securities	0	0
Trading account profit	(2,143)	(499)
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	15,471	7,244
Adjustments To Indemnity Reserves On Loans Sold	(3,875)	(9,848)
F D I C Loss Share Income	(15,255)	16,035
Fair value change in equity appreciation instrument	0	7,745
Gain on sale of processing and technology business		0
Noninterest Income Other Operating Income	21,535	12,875
Total non-interest income	131,284	141,222
Noninterest Expense Abstract
Labor And Related Expense	113,437	99,200
Occupancy Net	22,468	22,886
Equipment Expense	10,461	11,262
Taxes Other	12,725	11,642
Professional fees	64,089	62,424
Communication	6,998	7,078
Marketing And Advertising Expense	12,439	9,437
Federal Deposit Insurance Corporation Premium Expense	24,926	17,673
Loss on early extinguishment of debt	69	239
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	14,165	2,211
Other operating expenses	32,942	29,583
Amortization of intangibles	2,593	2,255
Total operating expenses	317,312	275,890
Income (loss) before income tax	77,519	160,267
Income tax expense	15,714	141,699
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	61,805	18,568
Equity in undistributed earnings (losses) of subsidiaries	0	0
Net Income (Loss) Attributable to Parent	61,805	18,568
Comprehensive Income Net Of Tax	58,330	(159)
Consolidation Eliminations Member
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0
Loans	(1,297)	(2,387)
Money market investments	(38)	(39)
Investment securities	(3,221)	(3,222)
Trading account securities	0	0
Total interest income	(4,556)	(5,648)
Interest Expense Abstract
Deposits	(81)	(161)
Short-term borrowings	(852)	(1,877)
Interest Expense Long Term Debt	(2,964)	(2,928)
Total interest expense	(3,897)	(4,966)
Net interest income	(659)	(682)
Provision for loan losses	0	0
Net interest income after provision for loan losses	(659)	(682)
Fees And Commissions Depositor Accounts	0	0
Other service fees	(2,923)	(3,388)
Sale and valuation adjustments of investment securities	0	0
Trading account profit	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0
F D I C Loss Share Income	0	0
Fair value change in equity appreciation instrument	0	0
Gain on sale of processing and technology business		0
Noninterest Income Other Operating Income	(13,345)	(13,291)
Total non-interest income	(16,268)	(16,679)
Noninterest Expense Abstract
Labor And Related Expense	0	0
Occupancy Net	824	885
Equipment Expense	0	0
Taxes Other	0	0
Professional fees	(18,018)	(18,589)
Communication	0	0
Marketing And Advertising Expense	0	0
Federal Deposit Insurance Corporation Premium Expense	0	0
Loss on early extinguishment of debt	0	0
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0
Other operating expenses	(477)	(501)
Amortization of intangibles	0	0
Total operating expenses	(17,671)	(18,205)
Income (loss) before income tax	744	844
Income tax expense	199	304
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	545	540
Equity in undistributed earnings (losses) of subsidiaries	(67,528)	(59,111)
Net Income (Loss) Attributable to Parent	(66,983)	(58,571)
Comprehensive Income Net Of Tax	$ (6,845)	$ (43,817)