Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Cash and due from banks	$ 702,485	$ 885,121
Interest-bearing deposits	3,630,846	3,646,756
Federal funds sold and resell agreements	30,792	24,248
Total cash and cash equivalents	4,364,123	4,556,125
Securities held to maturity, at amortized cost	2,926,486	3,139,748
Securities available for sale, at estimated fair value	8,461,254	5,895,436
Trading account securities	15,426	16,398
Loans, net of unearned discounts	10,987,535	9,515,700
Less: Allowance for loan losses	(99,542)	(92,438)
Net loans	10,887,993	9,423,262
Premises and equipment, net	442,888	313,331
Goodwill	653,950	536,649
Other intangible assets, net	12,125	6,345
Cash surrender value of life insurance policies	172,050	141,108
Accrued interest receivable and other assets	341,480	284,537
Total assets	28,277,775	24,312,939
Liabilities:
Non-interest-bearing demand deposits	10,149,061	8,311,149
Interest-bearing deposits	13,986,869	12,377,637
Total deposits	24,135,930	20,688,786
Federal funds purchased and repurchase agreements	803,119	668,253
Junior subordinated deferrable interest debentures	137,115	123,712
Other long-term borrowings	100,000	100,000
Accrued interest payable and other liabilities	250,208	218,027
Total liabilities	25,426,372	21,798,778
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 in both 2014 and 2013	144,486	144,486
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 63,632,464 shares issued in 2014 and 61,632,464 shares issued in 2013	637	617
Additional paid-in capital	886,476	724,197
Retained earnings	1,710,324	1,575,282
Accumulated other comprehensive income, net of tax	141,814	140,434
Treasury stock, at cost; 483,041 shares in 2014 and 1,066,021 in 2013	(32,334)	(70,855)
Total shareholders’ equity	2,851,403	2,514,161
Total liabilities and shareholders’ equity	$ 28,277,775	$ 24,312,939