CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 76,741	$ 72,091
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,892	23,908
(Accretion) of discount and amortization of premiums, net	(56,020)	(48,390)
Decrease in FDIC indemnification asset and receivable	53,634	31,899
Stock compensation costs	3,180	2,504
Tax benefit from stock compensation plans, net	(3,708)	(2,602)
Provision for loan losses	6,933	4,327
Impairment on other real estate owned	490	1,321
Net gain on sales of investment securities, loans and other assets	(10,458)	(8,592)
Originations and purchases of loans held for sale	(60,492)	(43,604)
Proceeds from sales of loans held for sale	38,050	6,272
Net proceeds from FDIC shared-loss agreements	4,139	33,890
Net change in accrued interest receivable and other assets	25,984	(12,525)
Net change in accrued expenses and other liabilities	(63,610)	20,557
Other net operating activities	(287)	(656)
Total adjustments	(40,273)	8,309
Net cash provided by operating activities	36,468	80,400
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisitions, net of cash paid	138,465
Net increase in:
Loans	(734,560)	(147,933)
Short-term investments	(65,793)	(12,651)
Purchases of:
Securities purchased under resale agreements		(250,000)
Investment securities available-for-sale	(138,149)	(267,882)
Loans receivable	(974)	(106,206)
Investments in affordable housing partnerships and other investments	(27,510)	(8,386)
Proceeds from sale of:
Investment securities available-for-sale	330,231	196,853
Loans receivable	47,852	22,566
Loans held for sale originated for investment	97,716
Other real estate owned	4,986	22,313
Repayments, maturities and redemptions of investment securities available-for-sale	151,358	87,889
Paydowns, maturities and termination of securities purchased under resale agreements	100,000	300,000
Redemption of Federal Home Loan Bank stock	12,930	10,480
Surrender of life insurance policies	14,769
Other net investing activities	(5,512)	(4,929)
Net cash used in investing activities	(74,191)	(157,886)
Net increase (decrease) in:
Deposits	1,096,290	626,348
Short-term borrowings		(20,000)
Proceeds from:
Issuance of common stock pursuant to various stock plans and agreements	283	442
Payment for:
Termination of securities purchased under resale agreements	(15,000)
Repayment of FHLB advances	(10,000)
Repayment of long-term debt	(15,310)
Repurchase of vested shares due to employee tax liability	(7,074)	(8,365)
Repurchase of shares of treasury stock pursuant to the Stock Repurchase Plan		(87,000)
Cash dividends	(26,139)	(22,782)
Tax benefit from stock compensation plans, net	3,708	2,602
Net cash provided by financing activities	1,026,758	491,245
NET INCREASE IN CASH AND CASH EQUIVALENTS	989,035	413,759
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	895,820	1,323,106
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,884,855	1,736,865
Cash paid during the period for:
Interest	27,803	28,885
Income tax payments, net of refunds	70,723	1,716
Noncash investing and financing activities:
Loans transferred to loans held for sale, net	433,841	21,855
Transfers to other real estate owned	15,628	23,230
Issuance of stock related to acquisition	$ 190,830