Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 137,747	$ 128,517
Short-term interest bearing accounts	2,693	864
Securities available for sale, at fair value	1,191,107	1,244,619
Securities held to maturity (fair value $62,401 and $72,198, respectively)	61,302	70,811
Trading securities	3,851	3,062
Federal Reserve and Federal Home Loan Bank stock	28,706	27,020
Loans and leases	4,251,119	3,800,203
Less allowance for loan and lease losses	70,734	71,334
Net loans and leases	4,180,385	3,728,869
Premises and equipment, net	77,326	74,541
Goodwill	152,251	132,029
Intangible assets, net	17,346	18,194
Bank owned life insurance	79,854	77,626
Other assets	96,348	92,254
Total assets	6,028,916	5,598,406
Liabilities
Demand (noninterest bearing)	1,187,502	1,052,906
Savings, NOW, and money market	2,599,556	2,381,116
Time	1,018,957	933,127
Total deposits	4,806,015	4,367,149
Short-term borrowings	137,365	181,592
Long-term debt	367,144	370,344
Trust preferred debentures	75,422	75,422
Other liabilities	66,309	65,789
Total liabilities	5,452,255	5,060,296
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at September 30, 2012 and December 31, 2011	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at September 30, 2012 and 50,000,000 December 31, 2011; issued 39,305,131 at September 30, 2012 and 38,035,539 at December 31, 2011	393	380
Additional paid-in-capital	345,934	317,329
Retained earnings	351,261	329,981
Accumulated other comprehensive loss	(3,746)	(6,104)
Common stock in treasury, at cost, 5,562,454 and 4,878,829 shares at September 30, 2012 and, December 31, 2011, respectively	(117,181)	(103,476)
Total stockholders' equity	576,661	538,110
Total liabilities and stockholders' equity	$ 6,028,916	$ 5,598,406