Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets:
Cash and due from banks	$ 790,106	$ 574,039
Interest-bearing deposits	2,650,425	2,314,251
Federal funds sold and resell agreements	84,448	19,302
Total cash and cash equivalents	3,524,979	2,907,592
Securities held to maturity, at amortized cost	2,956,381	365,996
Securities available for sale, at estimated fair value	6,203,299	7,789,700
Trading account securities	30,074	13,609
Loans, net of unearned discounts	9,223,848	7,995,129
Less: Allowance for loan losses	(104,453)	(110,147)
Net loans	9,119,395	7,884,982
Premises and equipment, net	315,934	319,042
Goodwill	535,509	528,072
Other intangible assets, net	8,147	10,604
Cash surrender value of life insurance policies	138,005	133,967
Accrued interest receivable and other assets	292,346	363,681
Total assets	23,124,069	20,317,245
Liabilities:
Non-interest-bearing demand deposits	8,096,937	6,672,555
Interest-bearing deposits	11,400,429	10,084,193
Total deposits	19,497,366	16,756,748
Federal funds purchased and repurchase agreements	561,061	722,202
Junior subordinated deferrable interest debentures	123,712	123,712
Other long-term borrowings	100,007	100,026
Accrued interest payable and other liabilities	424,441	331,020
Total liabilities	20,706,587	18,033,708
Shareholders' Equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; none issued
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 61,479,189 shares issued in 2012 and 61,271,603 shares issued in 2011	615	613
Additional paid-in capital	702,968	680,803
Retained earnings	1,475,851	1,354,759
Accumulated other comprehensive income, net of tax	238,048	247,734
Treasury stock, 7,640 shares in 2011, at cost		(372)
Total shareholders' equity	2,417,482	2,283,537
Total liabilities and shareholders' equity	$ 23,124,069	$ 20,317,245