Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 169,969	$ 203,364
Interest-bearing deposits with banks	1,498,356	1,394,813
Securities (fair value: $498,041 and $553,010, respectively)	497,986	552,949
Loans held for sale	7,626	13,725
Loans (net of unearned interest)	4,275,112	4,232,048
Allowance for loan losses	(44,571)	(41,666)
Loans, net of allowance for loan losses	4,230,541	4,190,382
Premises and equipment, net	127,093	126,813
Other real estate owned	3,963	7,984
Intangible assets, net	15,093	15,695
Goodwill	54,042	54,042
Accrued interest receivable and other assets	136,269	133,062
Total assets	6,740,938	6,692,829
Deposits:
Noninterest-bearing	2,413,700	2,409,769
Interest-bearing	3,597,172	3,563,589
Total deposits	6,010,872	5,973,358
Short-term borrowings	1,300	500
Accrued interest payable and other liabilities	34,146	31,502
Junior subordinated debentures	31,959	31,959
Total liabilities	6,078,277	6,037,319
Stockholders' equity:
Common stock, $1.00 par, 20,000,000 shares authorized; shares issued and outstanding: 15,527,804 and 15,597,446, respectively	15,528	15,597
Capital surplus	103,978	102,865
Retained earnings	541,098	535,521
Accumulated other comprehensive income, net of income tax of $1,297 and $962, respectively	2,057	1,527
Total stockholders' equity	662,661	655,510
Total liabilities and stockholders' equity	$ 6,740,938	$ 6,692,829
Senior Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value
Cumulative Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value