Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Shares Outstanding	Accumulated Other Comprehensive (Loss) Income	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Beginning balance at Dec. 31, 2010	$ 266,224	$ 91,332	$ (6,766)	$ 59,080	$ 151,978	$ (29,400)
Beginning balance, shares at Dec. 31, 2010		16,648,303
Net income	3,862				3,862
Other comprehensive loss, net of taxes	998		998
Cash dividends declared ($0.20 per share)	(3,333)				(3,333)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		41,862
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	773			15	13	745
Purchases of treasury stock, shares		(2,966)
Purchases of treasury stock	(51)					(51)
Restricted stock awards granted, shares		58,736
Restricted stock awards granted				(1,019)	47	972
Vesting of restricted stock awards	200			200
Ending balance at Mar. 31, 2011	268,673	91,332	(5,768)	58,276	152,567	(27,734)
Ending balance, shares at Mar. 31, 2011		16,745,935
Beginning balance at Dec. 31, 2011	272,979	91,332	(6,101)	58,495	157,566	(28,313)
Beginning balance, shares at Dec. 31, 2011		16,702,376
Net income	5,263				5,263
Other comprehensive loss, net of taxes	(486)		(486)
Cash dividends declared ($0.20 per share)	(3,349)				(3,349)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs, shares		59,347
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	941				(58)	999
Cancelled stock options and awards, shares		(13,125)
Cancelled stock options and awards	25			300	(62)	(213)
Tax expense on stock based compensation	(77)			(77)
Purchases of treasury stock, shares		(39,339)
Purchases of treasury stock	(611)					(611)
Restricted stock awards granted, shares		71,157
Restricted stock awards granted				(1,154)	(134)	1,288
Vesting of restricted stock awards	840			840
Ending balance at Mar. 31, 2012	$ 275,525	$ 91,332	$ (6,587)	$ 58,404	$ 159,226	$ (26,850)
Ending balance, shares at Mar. 31, 2012		16,780,416