Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and due from banks	$ 574,039	$ 587,847
Interest-bearing deposits	2,314,251	2,171,828
Federal funds sold and resell agreements	19,302	61,302
Total cash and cash equivalents	2,907,592	2,820,977
Securities held to maturity, at amortized cost	365,996	283,629
Securities available for sale, at estimated fair value	7,789,700	5,157,470
Trading account securities	13,609	15,101
Loans, net of unearned discounts	7,995,129	8,117,020
Less: Allowance for loan losses	(110,147)	(126,316)
Net loans	7,884,982	7,990,704
Premises and equipment, net	319,042	316,909
Goodwill	528,072	527,684
Other intangible assets, net	10,604	14,335
Cash surrender value of life insurance policies	133,967	129,922
Accrued interest receivable and other assets	363,681	360,361
Total assets	20,317,245	17,617,092
Liabilities:
Non-interest-bearing demand deposits	6,672,555	5,360,436
Interest-bearing deposits	10,084,193	9,118,906
Total deposits	16,756,748	14,479,342
Federal funds purchased and repurchase agreements	722,202	475,673
Junior subordinated deferrable interest debentures	123,712	123,712
Other long-term borrowings	100,026	250,045
Accrued interest payable and other liabilities	331,020	226,640
Total liabilities	18,033,708	15,555,412
Shareholders' Equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; none issued
Junior participating preferred stock, par value $0.01 per share; 250,000 shares authorized; none issued
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 61,271,603 shares issued in 2011 and 61,108,184 shares issued in 2010	613	611
Additional paid-in capital	680,803	657,335
Retained earnings	1,354,759	1,249,484
Accumulated other comprehensive income (loss), net of tax	247,734	154,250
Treasury stock, 7,640 shares in 2011, at cost	(372)
Total shareholders' equity	2,283,537	2,061,680
Total liabilities and shareholders' equity	$ 20,317,245	$ 17,617,092