Consolidated Statements Of Changes In Stockholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Mar. 31, 2012	$ 128,759	$ 33	$ 48,865	$ 80,067	$ (206)
Stock-based compensation	10		10
Net Income	2,599			2,599
Other comprehensive income	375				375
Cash dividends declared ($0.42 per share for three months ended June 30, 2012 and 2013 and $0.84 for six months ended June 30, 2012 and 2013 respectively)	(1,376)			(1,376)
Balance at Jun. 30, 2012	130,367	33	48,875	81,290	169
Balance at Dec. 31, 2011	127,333	33	48,865	78,713	(278)
Stock-based compensation	10		10
Net Income	5,329			5,329
Other comprehensive income	447				447
Cash dividends declared ($0.42 per share for three months ended June 30, 2012 and 2013 and $0.84 for six months ended June 30, 2012 and 2013 respectively)	(2,752)			(2,752)
Balance at Jun. 30, 2012	130,367	33	48,875	81,290	169
Balance at Dec. 31, 2012	132,446	33	48,905	83,798	(290)
Stock-based compensation	33		33
Net Income	5,365			5,365
Other comprehensive income	(2,208)				(2,208)
Cash dividends declared ($0.42 per share for three months ended June 30, 2012 and 2013 and $0.84 for six months ended June 30, 2012 and 2013 respectively)	(2,751)			(2,751)
Balance at Jun. 30, 2013	132,885	33	48,938	86,412	(2,498)
Balance at Mar. 31, 2013	133,225	33	48,920	84,943	(671)
Stock-based compensation	18		18
Net Income	2,844			2,844
Other comprehensive income	(1,827)				(1,827)
Cash dividends declared ($0.42 per share for three months ended June 30, 2012 and 2013 and $0.84 for six months ended June 30, 2012 and 2013 respectively)	(1,375)			(1,375)
Balance at Jun. 30, 2013	$ 132,885	$ 33	$ 48,938	$ 86,412	$ (2,498)