CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 146,106	$ 138,640
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,785	39,711
(Accretion) of discount and amortization of premiums, net	(104,247)	(96,885)
Decrease in FDIC indemnification asset and receivable	79,804	45,763
Stock compensation costs	5,898	7,773
Deferred tax expense (benefit)	320	(19,868)
Provision for loan losses	13,327	33,600
Impairment on other real estate owned	2,153	10,541
Net gain on sales of investment securities, loans and other assets	(16,512)	(14,854)
Prepayment penalty for Federal Home Loan Bank advances, net		3,657
Originations and purchases of loans held for sale	(71,572)	(34,716)
Proceeds from sales of loans held for sale	6,272
Net proceeds from FDIC shared-loss agreements	42,494	63,077
Net change in accrued interest receivable and other assets	55,158	(67,820)
Net change in accrued expenses and other liabilities	(43,579)	(43,142)
Other net operating activities	(4,671)	(2,007)
Total adjustments	11,630	(75,170)
Net cash provided by operating activities	157,736	63,470
Net (increase) decrease in:
Loans	(679,359)	184,443
Short-term investments	35,940	(192,880)
Federal funds sold		(30,000)
Purchases of:
Securities purchased under resale agreements	(300,000)	(200,000)
Investment securities available-for-sale	(699,650)	(482,500)
Loans receivable	(466,715)	(239,272)
Premises and equipment	(10,328)	(3,405)
Investments in affordable housing partnerships	(16,683)	(34,128)
Proceeds from sale of:
Investment securities available-for-sale	325,721	1,097,270
Loans receivable	55,129	58,205
Loans held for sale originated for investment		199,435
Other real estate owned	38,677	59,814
Premises and equipment	352	11
Repayments, maturities and redemptions of investment securities available-for-sale	262,074	606,704
Paydowns, maturities and termination of securities purchased under resale agreements	300,000	311,434
Redemption of Federal Home Loan Bank stock	21,136	12,674
Other net investing activities	(108)	(236)
Net cash (used in) provided by investing activities	(1,133,814)	1,347,569
Net increase (decrease) in:
Deposits	972,853	(110,498)
Short-term borrowings	(20,000)	(25,208)
Proceeds from:
Issuance of common stock pursuant to various stock plans and agreements	1,150	2,678
Payment for:
Repayment of FHLB advances		(57,616)
Modification of Federal Home Loan Bank advances		(37,678)
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan	(199,992)	(149,950)
Cash dividends	(44,961)	(32,642)
Other net financing activities	(5,864)	(1,239)
Net cash provided by (used in) financing activities	703,186	(412,153)
Effect of exchange rate changes on cash and cash equivalents		(457)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(272,892)	998,429
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,323,106	1,431,185
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,050,214	2,429,614
Cash paid during the period for:
Interest	58,336	73,938
Income tax payments, net of refunds	92,096	185,729
Noncash investing and financing activities:
Loans transferred to loans held for sale, net	19,125	21,317
Transfers to other real estate owned	29,782	54,478
Conversion of preferred stock to common stock	83,027
Loans to facilitate sales of other real estate owned and short sales	139	850
Loans to facilitate sales of loans		$ 638