CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 219,263	$ 209,750
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69,907	58,978
(Accretion) of discount and amortization of premiums, net	(180,119)	(152,297)
Decrease in FDIC indemnification asset and receivable	154,260	72,520
Stock compensation costs	9,893	12,137
Deferred tax expense	34,107	12,131
Provision for loan losses	16,898	52,100
Impairment on other real estate owned	2,102	13,342
Net gain on sales of investment securities, loans and other assets	(23,354)	(22,654)
Prepayment penalty for Federal Home Loan Bank advances, net		3,699
Originations and purchases of loans held for sale	(99,258)	(58,237)
Proceeds from sales of loans held for sale	6,272
Net proceeds from FDIC shared-loss agreements	51,890	83,801
Net change in accrued interest receivable and other assets	83,335	(71,753)
Net change in accrued expenses and other liabilities	(47,735)	(15,983)
Other net operating activities	(6,121)	(3,293)
Total adjustments	72,077	(15,509)
Net cash provided by operating activities	291,340	194,241
Net (increase) decrease in:
Loans	(1,549,830)	88,965
Short-term investments	73,286	(285,167)
Federal funds sold		(20,000)
Purchases of:
Securities purchased under resale agreements	(450,000)	(750,000)
Investment securities available-for-sale	(1,113,667)	(1,250,317)
Loans receivable	(577,811)	(371,352)
Premises and equipment	(87,443)	(5,826)
Investments in affordable housing partnerships and other investments	(25,860)	(45,500)
Proceeds from sale of:
Investment securities available-for-sale	386,108	1,130,024
Loans receivable	184,679	61,979
Loans held for sale originated for investment		338,022
Other real estate owned	47,892	76,239
Premises and equipment	1,818	12
Repayments, maturities and redemptions of investment securities available-for-sale	376,593	999,518
Paydowns, maturities and termination of securities purchased under resale agreements	600,000	436,434
Redemption of Federal Home Loan Bank stock	31,849	18,943
Other net investing activities	(210)	(360)
Net cash (used in) provided by investing activities	(2,102,596)	421,614
Net increase (decrease) in:
Deposits	2,049,786	213,425
Short-term borrowings	(20,000)	(25,208)
Proceeds from:
Increase in long-term borrowing	50,000
Issuance of common stock pursuant to various stock plans and agreements	2,112	3,136
Payment for:
Repayment of FHLB advances		(57,615)
Modification of Federal Home Loan Bank advances		(37,678)
Repayment of long-term debt		(75,000)
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan	(199,992)	(199,950)
Cash dividends	(65,625)	(48,472)
Other net financing activities	(5,748)	(2,406)
Net cash provided by (used in) financing activities	1,810,533	(229,768)
Effect of exchange rate changes on cash and cash equivalents		(900)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(723)	385,187
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,323,106	1,431,185
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,322,383	1,816,372
Cash paid during the period for:
Interest	84,643	104,829
Income tax payments, net of refunds	118,408	188,739
Noncash investing and financing activities:
Loans transferred to loans held for sale, net	13,912	148,755
Transfers to other real estate owned	33,685	62,755
Conversion of preferred stock to common stock	83,027
Loans to facilitate sales of other real estate owned and short sales	139	3,060
Loans to facilitate sales of loans		$ 1,018