Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 157,094	$ 128,517
Short-term interest bearing accounts	6,574	864
Securities available for sale, at fair value	1,147,999	1,244,619
Securities held to maturity (fair value $61,535 and $72,198)	60,563	70,811
Trading securities	3,918	3,062
Federal Reserve and Federal Home Loan Bank stock	29,920	27,020
Loans	4,277,616	3,800,203
Less allowance for loan losses	69,334	71,334
Net loans	4,208,282	3,728,869
Premises and equipment, net	77,875	74,541
Goodwill	152,373	132,029
Intangible assets, net	16,962	18,194
Bank owned life insurance	80,702	77,626
Other assets	99,997	92,254
Total assets	6,042,259	5,598,406
Liabilities
Demand (noninterest bearing)	1,242,712	1,052,906
Savings, NOW, and money market	2,558,376	2,381,116
Time	983,261	933,127
Total deposits	4,784,349	4,367,149
Short-term borrowings	162,941	181,592
Long-term debt	367,492	370,344
Trust preferred debentures	75,422	75,422
Other liabilities	69,782	65,789
Total liabilities	5,459,986	5,060,296
Stockholders' equity
Preferred stock, $0.01 par value; authorized 2,500,000 shares at December 31, 2012 and 2011	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at December 31, 2012 and 50,000,000 at December 31, 2011; issued 39,305,131 at December 31, 2012 and 38,035,539 at December 31, 2011	393	380
Additional paid-in-capital	346,692	317,329
Retained earnings	357,558	329,981
Accumulated other comprehensive loss	(5,880)	(6,104)
Common stock in treasury, at cost, 5,529,781 and 4,878,829 shares at December 31, 2012 and 2011, respectively	(116,490)	(103,476)
Total stockholders' equity	582,273	538,110
Total liabilities and stockholders' equity	$ 6,042,259	$ 5,598,406