CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 72,091	$ 68,083
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,908	19,459
(Accretion) of discount and amortization of premiums, net	(48,390)	(34,660)
Decrease in FDIC indemnification asset and receivable	31,899	5,418
Stock compensation costs	2,504	3,637
Deferred tax expense (benefit)	312	(20,159)
Provision for loan losses	4,327	18,100
Impairment on other real estate owned	1,321	7,389
Net gain on sales of investment securities, loans and other assets	(8,592)	(7,014)
Prepayment penalty for Federal Home Loan Bank advances, net		1,321
Originations and purchases of loans held for sale	(43,604)	(15,782)
Proceeds from sales of loans held for sale	6,272
Net proceeds from FDIC shared-loss agreements	33,890	39,358
Net change in accrued interest receivable and other assets	(12,525)	(27,165)
Net change in accrued expenses and other liabilities	20,557	40,427
Other net operating activities	(3,570)	(713)
Total adjustments	8,309	29,616
Net cash provided by operating activities	80,400	97,699
Net (increase) decrease in:
Loans	(147,933)	68,532
Short-term investments	(12,651)	(115,742)
Federal funds sold		(30,000)
Purchases of:
Securities purchased under resale agreements	(250,000)
Investment securities available-for-sale	(267,882)	(8,018)
Loans receivable	(106,206)	(116,486)
Investments in affordable housing partnerships	(8,386)	(17,850)
Proceeds from sale of:
Investment securities available-for-sale	196,853	260,261
Loans receivable	22,566	27,639
Loans held for sale originated for investment		52,559
Other real estate owned	22,313	22,791
Repayments, maturities and redemptions of investment securities available-for-sale	87,889	138,650
Paydowns, maturities and termination of securities purchased under resale agreements	300,000	136,434
Redemption of Federal Home Loan Bank stock	10,480	6,391
Other net investing activities	(4,929)	(832)
Net cash (used in) provided by investing activities	(157,886)	424,329
Net (decrease) increase in:
Deposits	626,348	(113,801)
Short-term borrowings	(20,000)	(25,208)
Proceeds from:
Issuance of common stock pursuant to various stock plans and agreements	442	1,539
Payment for:
Repayment of FHLB advances		(23,003)
Modification of Federal Home Loan Bank advances		(37,678)
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan	(87,000)	(100,978)
Cash dividends	(22,782)	(16,495)
Other net financing activities	(5,763)	(1,284)
Net cash provided by (used in) financing activities	491,245	(316,908)
Effect of exchange rate changes on cash and cash equivalents		(451)
NET INCREASE IN CASH AND CASH EQUIVALENTS	413,759	204,669
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,323,106	1,431,185
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,736,865	1,635,854
Cash paid during the period for:
Interest	28,885	34,140
Income tax payments, net of refunds	1,716	23,422
Noncash investing and financing activities:
Loans transferred to loans held for sale, net	21,855	40,800
Transfers to other real estate owned	23,230	39,572
Loans to facilitate sales of other real estate owned and short sales		$ 400