Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 163,188	$ 203,545
Interest-bearing deposits with banks	1,491,873	1,710,350
Securities (fair value: $507,923 and $524,861, respectively)	507,858	524,783
Loans held for sale	12,406	9,433
Loans (net of unearned interest)	3,959,669	3,851,398
Allowance for loan losses	(40,970)	(40,889)
Loans, net of allowance for loan losses	3,918,699	3,810,509
Premises and equipment, net	120,659	121,341
Other real estate owned	7,650	7,859
Intangible assets, net	9,203	10,635
Goodwill	44,594	44,962
Accrued interest receivable and other assets	129,966	131,555
Total assets	6,406,096	6,574,972
Deposits:
Noninterest-bearing	2,244,711	2,411,066
Interest-bearing	3,453,880	3,493,638
Total deposits	5,698,591	5,904,704
Short-term borrowings	3,777	3,982
Accrued interest payable and other liabilities	30,863	30,168
Junior subordinated debentures	26,804	26,804
Total liabilities	5,760,035	5,965,658
Stockholders' equity:
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,591,530 and 15,504,513, respectively	15,591	15,504
Capital surplus	100,835	96,841
Retained earnings	527,038	492,776
Accumulated other comprehensive income, net of income tax of $1,638 and $2,644, respectively	2,597	4,193
Total stockholders' equity	646,061	609,314
Total liabilities and stockholders' equity	$ 6,406,096	$ 6,574,972
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value