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			2,709			2,709
Stock-based compensation		82				82
Other comprehensive income (loss)					(1,220)	1,489
Balance at Mar. 31, 2013	34,330	42,710	92,264	(5,414)	1,666	165,556
Balance at Dec. 31, 2013	34,348	43,280	102,273	(5,414)	(7,289)	167,198
Net income			3,720			3,720
Stock-based compensation		165				165
Other comprehensive income (loss)					3,088	6,808
Balance at Mar. 31, 2014	$ 34,348	$ 43,445	$ 105,993	$ (5,414)	$ (4,201)	$ 174,171