Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 169,905	$ 157,625
Short-term interest bearing accounts	4,630	1,301
Securities available for sale, at fair value	1,044,502	1,364,881
Securities held to maturity (fair value $454,787 and $113,276, respectively)	459,620	117,283
Trading securities	7,622	5,779
Federal Reserve and Federal Home Loan Bank stock	34,652	46,864
Loans	5,587,091	5,406,795
Less allowance for loan losses	69,334	69,434
Net loans	5,517,757	5,337,361
Premises and equipment, net	89,023	88,327
Goodwill	263,634	264,997
Intangible assets, net	21,543	25,557
Bank owned life insurance	117,102	114,966
Other assets	137,041	127,234
Total assets	7,867,031	7,652,175
Liabilities
Demand (noninterest bearing)	1,724,134	1,645,641
Savings, NOW, and money market	3,514,155	3,223,441
Time	1,076,650	1,021,142
Total deposits	6,314,939	5,890,224
Short-term borrowings	375,637	456,042
Long-term debt	131,056	308,823
Junior subordinated debt	101,196	101,196
Other liabilities	86,763	79,321
Total liabilities	7,009,591	6,835,606
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at September 30, 2014 and December 31, 2013	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at September 30, 2014 and December 31, 2013; issued 49,651,494 at September 30, 2014 and December 31, 2013	497	497
Additional paid-in-capital	574,657	574,152
Retained earnings	414,695	385,787
Accumulated other comprehensive loss	(8,750)	(16,765)
Common stock in treasury, at cost, 5,944,696 and 6,138,444 shares at September 30, 2014 and December 31, 2013, respectively	(123,659)	(127,102)
Total stockholders' equity	857,440	816,569
Total liabilities and stockholders' equity	$ 7,867,031	$ 7,652,175