Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 133,632	$ 157,094
Short-term interest bearing accounts	165,514	6,574
Securities available for sale, at fair value	1,465,791	1,147,999
Securities held to maturity (fair value $63,361 and $61,535, respectively)	62,474	60,563
Trading securities	4,762	3,918
Federal Reserve and Federal Home Loan Bank stock	35,918	29,920
Loans and leases	5,195,033	4,277,616
Less allowance for loan and lease losses	68,734	69,334
Net loans and leases	5,126,299	4,208,282
Premises and equipment, net	88,582	77,875
Goodwill	263,645	152,373
Intangible assets, net	29,273	16,962
Bank owned life insurance	112,123	80,702
Other assets	122,818	99,997
Total assets	7,610,831	6,042,259
Liabilities
Demand (noninterest bearing)	1,503,849	1,242,712
Savings, NOW, and money market	3,345,634	2,558,376
Time	1,166,480	983,261
Total deposits	6,015,963	4,784,349
Short-term borrowings	185,871	162,941
Long-term debt	428,661	367,492
Trust preferred debentures	101,196	75,422
Other liabilities	75,845	69,782
Total liabilities	6,807,536	5,459,986
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at March 31, 2013 and December 31, 2012	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at March 31, 2013 and December 31, 2012; issued 49,651,494 at March 31, 2013 and 39,305,131 at December 31, 2012	497	393
Additional paid-in-capital	573,138	346,692
Retained earnings	358,449	357,558
Accumulated other comprehensive loss	(7,126)	(5,880)
Common stock in treasury, at cost, 5,910,399 and 5,529,781 shares at March 31, 2013 and December 31, 2012, respectively	(121,663)	(116,490)
Total stockholders' equity	803,295	582,273
Total liabilities and stockholders' equity	$ 7,610,831	$ 6,042,259