Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 156,852	$ 147,789
Short-term interest bearing accounts	2,812	1,392
Securities available for sale, at fair value	1,255,925	1,338,290
Securities held to maturity (fair value $481,871 and $525,050)	484,073	527,948
Trading securities	11,467	9,259
Federal Reserve Bank and Federal Home Loan Bank stock	46,706	47,033
Loans	6,584,773	6,198,057
Less allowance for loan losses	69,500	65,200
Net loans	6,515,273	6,132,857
Premises and equipment, net	81,305	84,187
Goodwill	268,043	265,439
Intangible assets, net	13,420	15,815
Bank owned life insurance	172,388	168,012
Other assets	128,548	129,247
Total assets	9,136,812	8,867,268
Liabilities
Demand (noninterest bearing)	2,286,892	2,195,845
Savings, NOW and money market	4,076,978	3,905,432
Time	806,766	872,411
Total deposits	7,170,636	6,973,688
Short-term borrowings	719,123	681,703
Long-term debt	88,869	104,087
Junior subordinated debt	101,196	101,196
Other liabilities	98,811	93,278
Total liabilities	8,178,635	7,953,952
Stockholders' equity
Preferred stock, $0.01 par value; authorized 2,500,000 shares at December 31, 2017 and 2016	0	0
Common stock, $0.01 par value; authorized 100,000,000 shares at December 31, 2017 and 2016, respectively; issued 49,651,493 at December 31, 2017 and 2016	497	497
Additional paid-in-capital	574,209	575,078
Retained earnings	543,713	501,761
Accumulated other comprehensive loss	(22,077)	(21,520)
Common stock in treasury, at cost, 6,108,684 and 6,393,743 shares at December 31, 2017 and 2016, respectively	(138,165)	(142,500)
Total stockholders' equity	958,177	913,316
Total liabilities and stockholders' equity	$ 9,136,812	$ 8,867,268