Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 205,884	$ 157,094
Short-term interest bearing accounts	2,358	6,574
Securities available for sale, at fair value	1,385,734	1,147,999
Securities held to maturity (fair value $115,620 and $61,535, respectively)	118,259	60,563
Trading securities	5,285	3,918
Federal Reserve and Federal Home Loan Bank stock	43,490	29,920
Loans	5,367,231	4,277,616
Less allowance for loan losses	70,184	69,334
Net loans	5,297,047	4,208,282
Premises and equipment, net	86,891	77,875
Goodwill	265,052	152,373
Intangible assets, net	26,857	16,962
Bank owned life insurance	113,821	80,702
Other assets	118,225	99,997
Total assets	7,668,903	6,042,259
Liabilities
Demand (noninterest bearing)	1,595,571	1,242,712
Savings, NOW, and money market	3,343,837	2,558,376
Time	1,063,730	983,261
Total deposits	6,003,138	4,784,349
Short-term borrowings	373,234	162,941
Long-term debt	309,009	367,492
Junior subordinated debt	101,196	75,422
Other liabilities	86,767	69,782
Total liabilities	6,873,344	5,459,986
Stockholders' equity
Preferred stock, $0.01 par value. Authorized 2,500,000 shares at September 30, 2013 and December 31, 2012	0	0
Common stock, $0.01 par value. Authorized 100,000,000 shares at September 30, 2013 and December 31, 2012; issued 49,651,494 at September 30, 2013 and 39,305,131 at December 31, 2012	497	393
Additional paid-in-capital	573,241	346,692
Retained earnings	377,046	357,558
Accumulated other comprehensive loss	(23,120)	(5,880)
Common stock in treasury, at cost, 6,377,701 and 5,529,781 shares at September 30, 2013 and December 31, 2012, respectively	(132,105)	(116,490)
Total stockholders' equity	795,559	582,273
Total liabilities and stockholders' equity	$ 7,668,903	$ 6,042,259