Condensed Consolidating Statement of Condition (Detail) (USD $)	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013	Dec. 31, 2012
Assets
Cash And Due From Banks	$ 321,914,000			$ 423,211,000	$ 368,590,000			$ 439,363,000
Money market investments	1,053,121,000			858,453,000
Trading Securities	145,343,000			339,743,000
Available For Sale Securities	5,727,766,000			5,294,800,000
Investment securities held-to-maturity, at amortized cost	112,893,000			140,496,000
Other investment securities, at lower of cost or realizable value	161,168,000			181,752,000
Loans held-for-sale, at lower of cost or fair value	178,008,000	[1]		110,426,000
Loans held-in-portfolio:
Loans held-in-portfolio	19,450,677,000			21,704,010,000
Covered Loans	2,654,263,000			2,984,427,000
Less- Unearned Income	91,461,000			92,144,000
Allowance for loan losses	611,375,000			640,555,000
Total loans held-in-portfolio, net	21,402,104,000			23,955,738,000
FDIC loss share asset	681,106,000		751,553,000	948,608,000	1,324,711,000		1,379,342,000	1,399,098,000
Premises and equipment, net	497,111,000			519,516,000
Interest Receivable	116,746,000			131,536,000
Servicing Asset At Fair Value Amount	152,282,000			161,099,000	161,445,000			154,430,000
Other Assets	1,634,819,000			1,687,558,000
Goodwill	461,246,000			647,757,000	647,757,000			647,757,000
Intangible Assets Net Excluding Goodwill	37,777,000			45,132,000
Total assets	34,099,095,000			35,749,333,000
Deposits Abstract
Noninterest Bearing Deposit Liabilities	5,521,415,000			5,922,682,000
Interest Bearing Deposit Liabilities	18,944,690,000			20,788,463,000
Total deposits	24,466,105,000			26,711,145,000
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	1,650,712,000			1,659,292,000
Other short-term borrowings	1,200,000			401,200,000
Notes Payable	1,723,573,000			1,584,754,000
Other liabilities	852,351,000			766,792,000
Total liabilities	29,800,703,000			31,123,183,000
Stockholders Equity Abstract
Preferred stock	50,160,000			50,160,000
Common stock	1,036,000			1,034,000
Surplus	4,171,890,000			4,170,152,000
Accumulated deficit	229,306,000			594,430,000
Treasury stock	(3,933,000)			(881,000)
Accumulated other comprehensive (loss) income, net of tax	(150,067,000)			(188,745,000)	(257,006,000)	[2]
Total stockholders' equity	4,298,392,000			4,626,150,000	4,393,885,000			4,110,000,000
Liabilities And Stockholders Equity	34,099,095,000			35,749,333,000
Segment, Discontinued Operations [Member]
Assets
Loans held-for-sale, at lower of cost or fair value	1,099,673,000
Loans held-in-portfolio:
Assets Of Disposal Group Including Discontinued Operation	1,129,053,000			0
Deposits Abstract
Total deposits	1,089,046,000
Other short-term borrowings	0
Liabilities Of Disposal Group Including Discontinued Operation	1,106,762,000			0
Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	135,256,000			135,501,000
Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Covered Loans	2,654,263,000			2,984,427,000
Real Estate Acquired Through Foreclosure	151,382,000			168,007,000
Parent Company [Member]
Assets
Cash And Due From Banks	4,329,000			10,595,000	5,744,000			1,103,000
Money market investments	19,718,000			18,721,000
Trading Securities	1,600,000			1,353,000
Available For Sale Securities	217,000			204,000
Investment securities held-to-maturity, at amortized cost	0			0
Other investment securities, at lower of cost or realizable value	9,850,000			10,850,000
Investment in subsidiaries	4,899,799,000			4,856,566,000
Loans held-for-sale, at lower of cost or fair value	0			0
Loans held-in-portfolio:
Loans held-in-portfolio	72,598,000			521,092,000
Covered Loans	0			0
Less- Unearned Income	0			0
Allowance for loan losses	12,000			304,000
Total loans held-in-portfolio, net	72,586,000			520,788,000
FDIC loss share asset	0			0
Premises and equipment, net	2,036,000			2,135,000
Interest Receivable	55,000			64,000
Servicing Asset At Fair Value Amount	0			0
Other Assets	64,584,000			66,577,000
Goodwill	0			0
Intangible Assets Net Excluding Goodwill	554,000			554,000
Assets Of Disposal Group Including Discontinued Operation	0			0
Total assets	5,075,438,000			5,488,407,000
Deposits Abstract
Noninterest Bearing Deposit Liabilities	0			0
Interest Bearing Deposit Liabilities	0			0
Total deposits	0			0
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	0			0
Other short-term borrowings	0			0
Notes Payable	740,812,000			822,351,000
Subordinated Debt	0			0
Other liabilities	36,234,000			39,906,000
Liabilities Of Disposal Group Including Discontinued Operation	0			0
Total liabilities	777,046,000			862,257,000
Stockholders Equity Abstract
Preferred stock	50,160,000			50,160,000
Common stock	1,036,000			1,034,000
Surplus	4,163,363,000			4,161,625,000
Accumulated deficit	237,833,000			602,957,000
Treasury stock	(3,933,000)			(881,000)
Accumulated other comprehensive (loss) income, net of tax	(150,067,000)			(188,745,000)
Total stockholders' equity	4,298,392,000			4,626,150,000
Liabilities And Stockholders Equity	5,075,438,000			5,488,407,000
Parent Company [Member] | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	110,000			0
Parent Company [Member] | Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	0			0
Non Guarantor Subsidiaries Member
Assets
Cash And Due From Banks	610,000			616,000	618,000			624,000
Money market investments	1,573,000			4,804,000
Trading Securities	0			0
Available For Sale Securities	0			0
Investment securities held-to-maturity, at amortized cost	0			0
Other investment securities, at lower of cost or realizable value	4,492,000			4,492,000
Investment in subsidiaries	1,354,550,000			1,670,809,000
Loans held-for-sale, at lower of cost or fair value	0			0
Loans held-in-portfolio:
Loans held-in-portfolio	0			0
Covered Loans	0			0
Less- Unearned Income	0			0
Allowance for loan losses	0			0
Total loans held-in-portfolio, net	0			0
FDIC loss share asset	0			0
Premises and equipment, net	0			0
Interest Receivable	31,000			114,000
Servicing Asset At Fair Value Amount	0			0
Other Assets	26,946,000			19,407,000
Goodwill	0			0
Intangible Assets Net Excluding Goodwill	0			0
Assets Of Disposal Group Including Discontinued Operation	0			0
Total assets	1,388,202,000			1,700,242,000
Deposits Abstract
Noninterest Bearing Deposit Liabilities	0			0
Interest Bearing Deposit Liabilities	0			0
Total deposits	0			0
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	0			0
Other short-term borrowings	8,126,000			0
Notes Payable	149,663,000			149,663,000
Subordinated Debt	0			0
Other liabilities	4,580,000			39,245,000
Liabilities Of Disposal Group Including Discontinued Operation	0			0
Total liabilities	162,369,000			188,908,000
Stockholders Equity Abstract
Preferred stock	0			0
Common stock	2,000			2,000
Surplus	4,269,208,000			4,479,208,000
Accumulated deficit	(3,030,906,000)			(2,940,509,000)
Treasury stock	0			0
Accumulated other comprehensive (loss) income, net of tax	(12,471,000)			(27,367,000)
Total stockholders' equity	1,225,833,000			1,511,334,000
Liabilities And Stockholders Equity	1,388,202,000			1,700,242,000
Non Guarantor Subsidiaries Member | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	0			0
Non Guarantor Subsidiaries Member | Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	0			0
Other Subsidiaries [Member]
Assets
Cash And Due From Banks	321,756,000			422,967,000	368,258,000			439,552,000
Money market investments	1,034,403,000			839,732,000
Trading Securities	143,743,000			338,390,000
Available For Sale Securities	5,727,549,000			5,294,596,000
Investment securities held-to-maturity, at amortized cost	112,893,000			140,496,000
Other investment securities, at lower of cost or realizable value	146,826,000			166,410,000
Investment in subsidiaries	0			0
Loans held-for-sale, at lower of cost or fair value	178,008,000			110,426,000
Loans held-in-portfolio:
Loans held-in-portfolio	19,449,005,000			21,702,418,000
Covered Loans	2,654,263,000			2,984,427,000
Less- Unearned Income	91,461,000			92,144,000
Allowance for loan losses	611,363,000			640,251,000
Total loans held-in-portfolio, net	21,400,444,000			23,954,450,000
FDIC loss share asset	681,106,000			948,608,000
Premises and equipment, net	495,075,000			517,381,000
Interest Receivable	116,666,000			131,368,000
Servicing Asset At Fair Value Amount	152,282,000			161,099,000
Other Assets	1,556,988,000			1,642,760,000
Goodwill	461,247,000			647,757,000
Intangible Assets Net Excluding Goodwill	37,223,000			44,578,000
Assets Of Disposal Group Including Discontinued Operation	1,129,053,000			0
Total assets	33,981,790,000			35,664,526,000
Deposits Abstract
Noninterest Bearing Deposit Liabilities	5,526,196,000			5,933,649,000
Interest Bearing Deposit Liabilities	18,947,263,000			20,793,267,000
Total deposits	24,473,459,000			26,726,916,000
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	1,650,712,000			1,659,292,000
Other short-term borrowings	64,000,000			920,700,000
Notes Payable	833,098,000			612,740,000
Subordinated Debt	0			0
Other liabilities	825,729,000			728,899,000
Liabilities Of Disposal Group Including Discontinued Operation	1,106,762,000			0
Total liabilities	28,953,760,000			30,648,547,000
Stockholders Equity Abstract
Preferred stock	0			0
Common stock	56,307,000			56,079,000
Surplus	5,907,664,000			6,056,774,000
Accumulated deficit	(786,679,000)			(907,972,000)
Treasury stock	0			0
Accumulated other comprehensive (loss) income, net of tax	(149,262,000)			(188,902,000)
Total stockholders' equity	5,028,030,000			5,015,979,000
Liabilities And Stockholders Equity	33,981,790,000			35,664,526,000
Other Subsidiaries [Member] | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	135,146,000			135,501,000
Other Subsidiaries [Member] | Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	151,382,000			168,007,000
Consolidation Eliminations Member
Assets
Cash And Due From Banks	(4,781,000)			(10,967,000)	(6,030,000)			(1,916,000)
Money market investments	(2,573,000)			(4,804,000)
Trading Securities	0			0
Available For Sale Securities	0			0
Investment securities held-to-maturity, at amortized cost	0			0
Other investment securities, at lower of cost or realizable value	0			0
Investment in subsidiaries	(6,254,349,000)			(6,527,375,000)
Loans held-for-sale, at lower of cost or fair value	0			0
Loans held-in-portfolio:
Loans held-in-portfolio	(70,926,000)			(519,500,000)
Covered Loans	0			0
Less- Unearned Income	0			0
Allowance for loan losses	0			0
Total loans held-in-portfolio, net	(70,926,000)			(519,500,000)
FDIC loss share asset	0			0
Premises and equipment, net	0			0
Interest Receivable	(6,000)			(10,000)
Servicing Asset At Fair Value Amount	0			0
Other Assets	(13,699,000)			(41,186,000)
Goodwill	(1,000)			0
Intangible Assets Net Excluding Goodwill	0			0
Assets Of Disposal Group Including Discontinued Operation	0			0
Total assets	(6,346,335,000)			(7,103,842,000)
Deposits Abstract
Noninterest Bearing Deposit Liabilities	(4,781,000)			(10,967,000)
Interest Bearing Deposit Liabilities	(2,573,000)			(4,804,000)
Total deposits	(7,354,000)			(15,771,000)
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase	0			0
Other short-term borrowings	(70,926,000)			(519,500,000)
Notes Payable	0			0
Subordinated Debt	0			0
Other liabilities	(14,192,000)			(41,258,000)
Liabilities Of Disposal Group Including Discontinued Operation	0			0
Total liabilities	(92,472,000)			(576,529,000)
Stockholders Equity Abstract
Preferred stock	0			0
Common stock	(56,309,000)			(56,081,000)
Surplus	(10,168,345,000)			(10,527,455,000)
Accumulated deficit	3,809,058,000			3,839,954,000
Treasury stock	0			0
Accumulated other comprehensive (loss) income, net of tax	161,733,000			216,269,000
Total stockholders' equity	(6,253,863,000)			(6,527,313,000)
Liabilities And Stockholders Equity	(6,346,335,000)			(7,103,842,000)
Consolidation Eliminations Member | Non Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	0			0
Consolidation Eliminations Member | Covered Under Loss Sharing Agreements With F D I C [Member]
Loans held-in-portfolio:
Real Estate Acquired Through Foreclosure	$ 0			$ 0

[1] Loans held-for-sale from discontinued operations are presented as part of "Assets from Discontinued Operations" in the Consolidated Statement of Condition. Refer to Note 3 to the consolidated financial statements for further information on the discontinued operations.

[2] All amounts presented are net of tax.