Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 595,733	$ 790,106
Interest-bearing deposits	2,296,349	2,650,425
Federal funds sold and resell agreements	9,273	84,448
Total cash and cash equivalents	2,901,355	3,524,979
Securities held to maturity, at amortized cost	3,166,692	2,956,381
Securities available for sale, at estimated fair value	6,033,370	6,203,299
Trading account securities	16,777	30,074
Loans, net of unearned discounts	9,232,543	9,223,848
Less: Allowance for loan losses	(93,400)	(104,453)
Net loans	9,139,143	9,119,395
Premises and equipment, net	306,069	315,934
Goodwill	535,509	535,509
Other intangible assets, net	6,539	8,147
Cash surrender value of life insurance policies	139,704	138,005
Accrued interest receivable and other assets	326,356	292,346
Total assets	22,571,514	23,124,069
Liabilities:
Non-interest-bearing demand deposits	7,744,676	8,096,937
Interest-bearing deposits	11,333,543	11,400,429
Total deposits	19,078,219	19,497,366
Federal funds purchased and repurchase agreements	549,823	561,061
Junior subordinated deferrable interest debentures	123,712	123,712
Other long-term borrowings	100,000	100,007
Accrued interest payable and other liabilities	291,922	424,441
Total liabilities	20,143,676	20,706,587
Shareholders' Equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; 6,000,000 Series A shares ($25 liquidation preference) issued at June 30, 2013, none issued at December 31, 2012	144,486
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 60,236,336 shares issued at June 30, 2013 and 61,479,189 shares issued at December 31, 2012	616	615
Additional paid-in capital	686,920	702,968
Retained earnings	1,524,638	1,475,851
Accumulated other comprehensive income, net of tax	155,602	238,048
Treasury stock, 1,396,128 shares at June 30, 2013, at cost	(84,424)
Total shareholders' equity	2,427,838	2,417,482
Total liabilities and shareholders' equity	$ 22,571,514	$ 23,124,069