Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 182,071	$ 157,625
Short-term interest bearing accounts	3,493	1,301
Securities available for sale, at fair value	1,377,585	1,364,881
Securities held to maturity (fair value $114,920 and $113,276, respectively)	117,896	117,283
Trading securities	6,954	5,779
Federal Reserve and Federal Home Loan Bank stock	41,458	46,864
Loans	5,482,025	5,406,795
Less allowance for loan losses	69,434	69,434
Net loans	5,412,591	5,337,361
Premises and equipment, net	87,647	88,327
Goodwill	263,634	264,997
Intangible assets, net	24,248	25,557
Bank owned life insurance	115,775	114,966
Other assets	119,777	127,234
Total assets	7,753,129	7,652,175
Liabilities
Demand (noninterest bearing)	1,616,612	1,645,641
Savings, NOW, and money market	3,482,925	3,223,441
Time	969,361	1,021,142
Total deposits	6,068,898	5,890,224
Short-term borrowings	356,878	456,042
Long-term debt	308,679	308,823
Junior subordinated debt	101,196	101,196
Other liabilities	85,276	79,321
Total liabilities	6,920,927	6,835,606
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at March 31, 2014 and December 31, 2013	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at March 31, 2014 and December 31, 2013; issued 49,651,494 at March 31, 2014 and December 31, 2013	497	497
Additional paid-in-capital	574,071	574,152
Retained earnings	394,589	385,787
Accumulated other comprehensive loss	(11,550)	(16,765)
Common stock in treasury, at cost, 6,050,806 and 6,138,444 shares at March 31, 2014 and December 31, 2013, respectively	(125,405)	(127,102)
Total stockholders' equity	832,202	816,569
Total liabilities and stockholders' equity	$ 7,753,129	$ 7,652,175