CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (USD $) In Thousands	Common stock [Member]	Surplus [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss), net of tax [Member]	Total
Balance at Dec. 31, 2012	$ 34,330	$ 42,628	$ 89,555	$ (5,414)	$ 2,886
Net income			5,478			5,478
Stock options exercised	17	73
Stock-based compensation	0	198				198
Other comprehensive income (loss)					(10,719)	(5,241)
Balance at Jun. 30, 2013	34,347	42,899	95,033	(5,414)	(7,833)	159,032
Balance at Dec. 31, 2013	34,348	43,280	102,273	(5,414)	(7,289)	167,198
Net income			7,491			7,491
Stock options exercised	8	42
Stock-based compensation	192	193				385
Other comprehensive income (loss)					5,181	12,672
Balance at Jun. 30, 2014	$ 34,548	$ 43,515	$ 109,764	$ (5,414)	$ (2,108)	$ 180,305