Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 180,051	$ 183,921
Interest-bearing deposits with banks	1,857,961	1,666,540
Federal funds sold	200	700
Securities (fair value: $463,285 and $469,871, respectively)	463,250	469,833
Loans held for sale	7,754	9,318
Loans (net of unearned interest)	4,390,775	4,400,232
Allowance for loan losses	(47,921)	(48,693)
Loans, net of allowance for loan losses	4,342,854	4,351,539
Premises and equipment, net	127,124	126,771
Other real estate owned	4,018	3,526
Intangible assets, net	12,768	13,330
Goodwill	54,042	54,042
Accrued interest receivable and other assets	139,615	139,432
Total assets	7,189,637	7,018,952
Deposits:
Noninterest-bearing	2,652,691	2,526,842
Interest-bearing	3,741,936	3,721,215
Total deposits	6,394,627	6,248,057
Short-term borrowings	800	500
Accrued interest payable and other liabilities	32,378	27,342
Junior subordinated debentures	31,959	31,959
Total liabilities	6,459,764	6,307,858
Stockholders' equity:
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,891,276 and 15,810,935, respectively	15,891	15,811
Capital surplus	120,435	117,541
Retained earnings	593,631	577,648
Accumulated other comprehensive (loss) income, net of income tax of $54 and $(59), respectively	(84)	94
Total stockholders' equity	729,873	711,094
Total liabilities and stockholders' equity	7,189,637	7,018,952
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value