Condensed Consolidating Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	$ 0	$ 0	$ 0	$ 0
Loans	387,381	428,999	1,164,665	1,294,834
Money market investments	862	886	2,774	2,759
Investment securities	39,945	51,085	128,828	157,183
Trading account securities	5,815	10,788	17,669	29,332
Total interest income	434,003	491,758	1,313,936	1,484,108
Interest Expense Abstract
Deposits	43,000	65,868	143,193	213,419
Short-term borrowings	9,876	13,744	36,503	41,478
Interest Expense Long Term Debt	37,701	42,835	112,032	141,999
Total interest expense	90,577	122,447	291,728	396,896
Net interest income	343,426	369,311	1,022,208	1,087,212
Provision for loan losses	106,208	176,276	326,130	395,912
Net interest income after provision for loan losses	237,218	193,035	696,078	691,300
Fees And Commissions Depositor Accounts	45,858	46,346	138,577	138,778
Other service fees	64,784	62,664	192,850	179,623
Sale and valuation adjustments of investment securities	64	8,134	(285)	8,044
Trading account profit	(2,266)	2,912	(11,692)	3,287
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	18,495	20,294	18,569	14,756
Adjustments To Indemnity Reserves On Loans Sold	(8,717)	(10,285)	(17,990)	(29,587)
F D I C Loss Share Income	(6,707)	(5,361)	(19,387)	49,344
Fair value change in equity appreciation instrument	0	0	0	8,323
Noninterest Income Other Operating Income	4,198	(2,314)	32,699	38,350
Total non-interest income	115,709	122,390	333,341	410,918
Noninterest Expense Abstract
Labor And Related Expense	111,550	111,724	349,377	328,823
Occupancy Net	24,409	25,885	73,534	76,428
Equipment Expense	11,447	10,517	33,688	33,314
Taxes Other	12,666	12,391	38,178	38,986
Professional fees	53,412	48,756	153,644	144,923
Communication	6,500	6,800	20,276	21,198
Marketing And Advertising Expense	14,924	14,650	44,754	35,842
Federal Deposit Insurance Corporation Premium Expense	24,173	23,285	72,006	68,640
Loss on early extinguishment of debt	43	109	25,184	8,637
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	5,896	3,234	22,441	11,885
Other operating expenses	22,854	22,541	73,714	63,555
Amortization of intangibles	2,481	2,463	7,605	6,973
Total operating expenses	290,355	282,355	914,401	839,204
Income (loss) before income tax	62,572	33,070	115,018	263,014
Income tax expense	15,384	5,537	(46,317)	114,664
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	47,188	27,533	161,335	148,350
Equity in undistributed earnings (losses) of subsidiaries	0	0	0	0
Net Income (Loss) Attributable to Parent	47,188	27,533	161,335	148,350
Comprehensive Income Net Of Tax	44,336	48,337	144,448	209,886
Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	83,589	150,703	247,846	306,177
Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	22,619	25,573	78,284	89,735
Parent Company [Member]
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0	5,000	0
Loans	1,759	1,915	4,966	6,973
Money market investments	0	0	13	5
Investment securities	4,052	4,031	12,240	12,192
Trading account securities	0	0	0	0
Total interest income	5,811	5,946	22,219	19,170
Interest Expense Abstract
Deposits	0	0	0	0
Short-term borrowings	0	0	0	50
Interest Expense Long Term Debt	24,118	22,983	71,462	71,315
Total interest expense	24,118	22,983	71,462	71,365
Net interest income	(18,307)	(17,037)	(49,243)	(52,195)
Provision for loan losses			267	0
Net interest income after provision for loan losses	(18,225)	(17,037)	(49,510)	(52,195)
Fees And Commissions Depositor Accounts	0	0	0	0
Other service fees	0	0	0	0
Sale and valuation adjustments of investment securities	0	0	0	0
Trading account profit	0	0	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0	0	0
F D I C Loss Share Income	0	0	0	0
Fair value change in equity appreciation instrument	0	0	0	0
Gain on sale of processing and technology business		0		0
Noninterest Income Other Operating Income	103	(1,823)	4,540	18,531
Total non-interest income	103	(1,823)	4,540	18,531
Noninterest Expense Abstract
Labor And Related Expense	6,675	8,280	22,028	22,142
Occupancy Net	844	802	2,577	2,506
Equipment Expense	1,021	831	2,802	2,411
Taxes Other	368	803	1,796	1,465
Professional fees	3,647	2,658	8,519	9,330
Communication	114	75	340	309
Marketing And Advertising Expense	425	430	1,326	1,238
Federal Deposit Insurance Corporation Premium Expense	0	0	0	0
Loss on early extinguishment of debt	0	0	0	8,000
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0	0	0
Other operating expenses	(12,468)	(12,733)	(37,138)	(38,250)
Amortization of intangibles	0	0	0	0
Total operating expenses	626	1,146	2,250	9,151
Income (loss) before income tax	(18,748)	(20,006)	(47,220)	(42,815)
Income tax expense	72	(642)	(1,185)	2,495
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	(18,820)	(19,364)	(46,035)	(45,310)
Equity in undistributed earnings (losses) of subsidiaries	66,008	46,897	207,370	193,660
Net Income (Loss) Attributable to Parent	47,188	27,533	161,335	148,350
Comprehensive Income Net Of Tax	44,336	48,337	144,448	209,886
Parent Company [Member] | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	(82)	0	267	0
Parent Company [Member] | Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	0	0	0	0
Non Guarantor Subsidiaries Member
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0	0	0
Loans	0	0	0	0
Money market investments	3	1	25	4
Investment securities	81	81	242	242
Trading account securities	0	0	0	0
Total interest income	84	82	267	246
Interest Expense Abstract
Deposits	0	0	0	0
Short-term borrowings	2	138	144	694
Interest Expense Long Term Debt	8,067	8,054	24,223	23,341
Total interest expense	8,069	8,192	24,367	24,035
Net interest income	(7,985)	(8,110)	(24,100)	(23,789)
Provision for loan losses			0	0
Net interest income after provision for loan losses	(7,985)	(8,110)	(24,100)	(23,789)
Fees And Commissions Depositor Accounts	0	0	0	0
Other service fees	0	0	0	0
Sale and valuation adjustments of investment securities	0	0	0	0
Trading account profit	0	0	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0	0	0
F D I C Loss Share Income	0	0	0	0
Fair value change in equity appreciation instrument	0	0	0	0
Gain on sale of processing and technology business		0		0
Noninterest Income Other Operating Income	(1,149)	(306)	380	1,082
Total non-interest income	(1,149)	(306)	380	1,082
Noninterest Expense Abstract
Labor And Related Expense	0	0	0	0
Occupancy Net	0	1	2	2
Equipment Expense	0	0	0	0
Taxes Other	0	0	0	0
Professional fees	3	3	9	9
Communication	0	1	0	10
Marketing And Advertising Expense	0	0	0	0
Federal Deposit Insurance Corporation Premium Expense	0	0	0	0
Loss on early extinguishment of debt	0	0	0	0
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0	0	0	0
Other operating expenses	110	111	331	332
Amortization of intangibles	0	0	0	0
Total operating expenses	113	116	342	353
Income (loss) before income tax	(9,247)	(8,532)	(24,062)	(23,060)
Income tax expense	0	(23)	0	(287)
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	(9,247)	(8,509)	(24,062)	(22,773)
Equity in undistributed earnings (losses) of subsidiaries	5,203	5,424	18,417	25,868
Net Income (Loss) Attributable to Parent	(4,044)	(3,085)	(5,645)	3,095
Comprehensive Income Net Of Tax	(4,082)	13,487	(7,555)	37,499
Non Guarantor Subsidiaries Member | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	0	0	0	0
Non Guarantor Subsidiaries Member | Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	0	0	0	0
Other Subsidiaries [Member]
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0	0	0
Loans	386,922	428,469	1,163,409	1,293,123
Money market investments	862	886	2,773	2,809
Investment securities	39,028	50,194	125,978	154,412
Trading account securities	5,815	10,788	17,669	29,332
Total interest income	432,627	490,337	1,309,829	1,479,676
Interest Expense Abstract
Deposits	43,025	65,935	143,321	213,687
Short-term borrowings	10,761	14,575	38,883	44,685
Interest Expense Long Term Debt	8,427	14,711	25,083	56,079
Total interest expense	62,213	95,221	207,287	314,451
Net interest income	370,414	395,116	1,102,542	1,165,225
Provision for loan losses			325,863	395,912
Net interest income after provision for loan losses	264,124	218,840	776,679	769,313
Fees And Commissions Depositor Accounts	45,858	46,346	138,577	138,778
Other service fees	68,385	66,306	203,571	191,339
Sale and valuation adjustments of investment securities	64	8,134	(285)	8,044
Trading account profit	(2,266)	2,912	(11,692)	3,287
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	18,495	20,294	18,569	14,756
Adjustments To Indemnity Reserves On Loans Sold	(8,717)	(10,285)	(17,990)	(29,587)
F D I C Loss Share Income	(6,707)	(5,361)	(19,387)	49,344
Fair value change in equity appreciation instrument	0	0	0	8,323
Gain on sale of processing and technology business		0		0
Noninterest Income Other Operating Income	18,036	12,104	66,846	57,039
Total non-interest income	133,148	140,450	378,209	441,323
Noninterest Expense Abstract
Labor And Related Expense	104,875	103,444	327,349	306,681
Occupancy Net	22,772	24,227	68,564	71,299
Equipment Expense	10,426	9,686	30,886	30,903
Taxes Other	12,298	11,588	36,382	37,521
Professional fees	67,875	63,894	198,867	190,213
Communication	6,386	6,724	19,936	20,879
Marketing And Advertising Expense	14,499	14,220	43,428	34,604
Federal Deposit Insurance Corporation Premium Expense	24,173	23,285	72,006	68,640
Loss on early extinguishment of debt	43	109	25,184	637
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	5,896	3,234	22,441	11,885
Other operating expenses	35,755	35,771	112,059	103,178
Amortization of intangibles	2,481	2,463	7,605	6,973
Total operating expenses	307,479	298,645	964,707	883,413
Income (loss) before income tax	89,793	60,645	190,181	327,223
Income tax expense	15,103	5,878	(45,395)	111,831
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	74,690	54,767	235,576	215,392
Equity in undistributed earnings (losses) of subsidiaries	0	0	0	0
Net Income (Loss) Attributable to Parent	74,690	54,767	235,576	215,392
Comprehensive Income Net Of Tax	71,037	76,389	216,930	275,961
Other Subsidiaries [Member] | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	83,671	150,703	247,579	306,177
Other Subsidiaries [Member] | Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	22,619	25,573	78,284	89,735
Consolidation Eliminations Member
Interest And Dividend Income Operating Abstract
Dividend income from subsidiaries	0	0	(5,000)	0
Loans	(1,300)	(1,385)	(3,710)	(5,262)
Money market investments	(3)	(1)	(37)	(59)
Investment securities	(3,216)	(3,221)	(9,632)	(9,663)
Trading account securities	0	0	0	0
Total interest income	(4,519)	(4,607)	(18,379)	(14,984)
Interest Expense Abstract
Deposits	(25)	(67)	(128)	(268)
Short-term borrowings	(887)	(969)	(2,524)	(3,951)
Interest Expense Long Term Debt	(2,911)	(2,913)	(8,736)	(8,736)
Total interest expense	(3,823)	(3,949)	(11,388)	(12,955)
Net interest income	(696)	(658)	(6,991)	(2,029)
Provision for loan losses			0	0
Net interest income after provision for loan losses	(696)	(658)	(6,991)	(2,029)
Fees And Commissions Depositor Accounts	0	0	0	0
Other service fees	(3,601)	(3,642)	(10,721)	(11,716)
Sale and valuation adjustments of investment securities	0	0	0	0
Trading account profit	0	0	0	0
Net gain on sale of loans, including valuation adjustments on loans held-for-sale	0	0	0	0
Adjustments To Indemnity Reserves On Loans Sold	0	0	0	0
F D I C Loss Share Income	0	0	0	0
Fair value change in equity appreciation instrument	0	0	0	0
Gain on sale of processing and technology business		0		0
Noninterest Income Other Operating Income	(12,792)	(12,289)	(39,067)	(38,302)
Total non-interest income	(16,393)	(15,931)	(49,788)	(50,018)
Noninterest Expense Abstract
Labor And Related Expense	0	0	0	0
Occupancy Net	793	855	2,391	2,621
Equipment Expense	0	0	0	0
Taxes Other	0	0	0	0
Professional fees	(18,113)	(17,799)	(53,751)	(54,629)
Communication	0	0	0	0
Marketing And Advertising Expense	0	0	0	0
Federal Deposit Insurance Corporation Premium Expense	0	0	0	0
Loss on early extinguishment of debt	0	0	0	0
Other Real Estate Owned Expense Net Of Gain Loss On Sale Or Disposition	0		0	0
Other operating expenses	(543)	(608)	(1,538)	(1,705)
Amortization of intangibles	0	0	0	0
Total operating expenses	(17,863)	(17,552)	(52,898)	(53,713)
Income (loss) before income tax	774	963	(3,881)	1,666
Income tax expense	209	324	263	625
Income Loss Before Equity In Undistributed Earnings Of Subsidiaries	565	639	(4,144)	1,041
Equity in undistributed earnings (losses) of subsidiaries	(71,211)	(52,321)	(225,787)	(219,528)
Net Income (Loss) Attributable to Parent	(70,646)	(51,682)	(229,931)	(218,487)
Comprehensive Income Net Of Tax	(66,955)	(89,876)	(209,375)	(313,460)
Consolidation Eliminations Member | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	0	0	0	0
Consolidation Eliminations Member | Covered Under Loss Sharing Agreements With F D I C [Member]
Interest Expense Abstract
Provision for loan losses	$ 0	$ 0	$ 0	$ 0