CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]	Total
Beginning balance at Dec. 31, 2013	$ 34,348	$ 43,280	$ 102,273	$ (5,414)	$ (7,289)
Net income			15,295			$ 15,295
Dividend reinvestment	16	120
Stock options exercised	46	200
Stock-based compensation	181	630
Other comprehensive (loss) income					446	446
Cash dividends on common stock			(1,399)
Ending Balance at Dec. 31, 2014	34,591	44,230	116,169	(5,414)	(6,843)	182,733
Net income			17,687			17,687
Dividend reinvestment	85	761
Stock options exercised	98	441
Stock-based compensation	142	807
Other comprehensive (loss) income					(1,733)	(1,733)
Cash dividends on common stock			(3,763)
Ending Balance at Dec. 31, 2015	34,916	46,239	130,093	(5,414)	(8,576)	197,258
Net income			19,831			19,831
Dividend reinvestment	201	2,100
Stock options exercised	28	173
Stock-based compensation	111	1,020
Other comprehensive (loss) income					(943)	(943)
Cash dividends on common stock			(4,751)
Ending Balance at Dec. 31, 2016	$ 35,256	$ 49,532	$ 145,173	$ (5,414)	$ (9,519)	$ 215,028