CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 295,045	$ 281,650	$ 245,234
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	101,169	82,536	67,460
(Accretion) of discount and amortization of premiums, net	(245,665)	(233,607)	(210,868)
Decrease in FDIC indemnification asset and receivable	228,585	122,251	100,141
Stock compensation costs	14,178	13,238	13,543
Deferred tax (benefit) expenses	(45,028)	(12,650)	189,497
Tax benefit from stock plans	(5,522)	(462)	(717)
Provision for loan losses	22,364	65,184	95,006
Impairment on other real estate owned	3,849	16,035	29,266
Net gain on sales of investment securities, loans and other assets	(30,224)	(28,165)	(30,998)
Originations and purchases of loans held for sale	(99,688)	(103,059)	(72,761)
Proceeds from sales of loans held for sale	6,272	13,844	41,388
Prepayment penalty for Federal Home Loan Bank advances and other borrowings, net		6,860	12,281
Net proceeds from FDIC shared-loss agreements	55,826	76,094	159,983
Net change in accrued interest receivable and other assets	58,881	(23,393)	(146,911)
Net change in accrued expenses and other liabilities	69,581	15,086	(233,868)
Other net operating activities	(3,778)	(3,916)	(2,359)
Total adjustments	130,800	5,876	10,083
Net cash provided by operating activities	425,845	287,526	255,317
Net (increase) decrease in:
Loans	(2,458,694)	(337,685)	(934,773)
Short-term investments	108,905	(304,544)	81,726
Purchases of:
Securities purchased under resale agreements	(450,000)	(1,400,000)	(1,292,066)
Investment securities available-for-sale	(1,316,764)	(1,835,823)	(2,713,546)
Loans receivable	(680,821)	(461,878)	(675,298)
Premises and equipment	(88,108)	(10,280)	(10,507)
Investments in affordable housing partnerships and other investments	(42,149)	(57,831)	(36,642)
Proceeds from sale of:
Investment securities available-for-sale	663,569	1,230,134	702,616
Loans receivable	259,117	76,832	188,407
Loans held for sale originated for investment	111,054	338,046	611,291
Other real estate owned	64,312	100,547	177,015
Premises and equipment	6,061	18,914	9,227
Investments in affordable housing partnerships and other investments			7,100
Other investments			2,454
Repayments, maturities and redemptions of investment securities available-for-sale	444,057	1,119,098	1,780,457
Paydowns, maturities and termination of securities purchased under resale agreements	600,000	736,434	1,005,632
Redemption of Federal Home Loan Bank stock	44,945	29,622	25,908
Other net investing activities	(330)	(491)	(227)
Net cash used in investing activities	(2,734,846)	(758,905)	(1,071,226)
Net increase (decrease) in:
Deposits	2,103,564	856,352	1,812,375
Short-term borrowings	(20,000)	(5,208)	(63,337)
Proceeds from:
Increase in long-term borrowings	100,000
Issuance of common stock pursuant to various stock plans and agreements	3,054	3,821	5,726
Payment for:
Repayment of FHLB advances		(100,857)	(760,274)
Modification of Federal Home Loan Bank advances		(48,190)
Repayment of long-term debt	(10,310)	(75,000)	(23,918)
Repayment of other borrowings			(11,250)
Repurchase of common stock warrants			(14,500)
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan	(199,992)	(199,950)
Repurchase of vested shares due to employee tax liability	(13,833)	(3,012)	(649)
Cash dividends	(86,290)	(64,218)	(30,679)
Tax benefit from stock compensation plans	5,522	462	717
Net cash provided by (used in) financing activities	1,881,715	364,200	914,211
Effect of exchange rate changes on cash and cash equivalents		(900)	(1,066)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(427,286)	(108,079)	97,236
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	1,323,106	1,431,185	1,333,949
CASH AND CASH EQUIVALENTS, END OF YEAR	895,820	1,323,106	1,431,185
Cash paid during the year for:
Interest	112,169	136,760	175,772
Income tax payments, net of refunds	142,980	183,398	326,725
Noncash investing and financing activities:
Transfers to other real estate owned	43,989	81,605	175,551
Conversion of preferred stock to common stock	83,027		31
Loans to facilitate sales of other real estate owned	139	6,380	8,882
Loans to facilitate sales of loans		1,018	27,149
Loans to facilitate sale of premises and equipment			11,100
Loans transferred to loans held for sale, net	97,065	144,131	644,915
Issuance of common stock to Board of Directors	$ 630	$ 570	$ 520