Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2009	$ 4,299	$ 32,832	$ 54,566	$ (5,138)	$ (7,793)	$ 78,766
Net income			7,612			7,612
Total other comprehensive income (loss)				504		504
Cash dividends declared			(4,194)			(4,194)
Treasury shares issued to fund dividend reinvestment plan		(31)			648	617
Treasury shares issued under stock option plans		(3)			29	26
Common stock issued under stock option plan	18	298				316
Balance at Dec. 31, 2010	4,317	33,096	57,984	(5,642)	(7,116)	82,639
Net income			6,569			6,569
Total other comprehensive income (loss)				(511)		(511)
Cash dividends declared			(4,273)			(4,273)
Treasury shares issued under stock option plans		(2)			32	30
Common stock issued under dividend reinvestment plan	102	1,604				1,706
Balance at Dec. 31, 2011	4,419	34,698	60,280	(5,131)	(7,084)	87,182
Net income			5,365			5,365
Total other comprehensive income (loss)				(1,081)		(1,081)
Cash dividends declared			(3,170)			(3,170)
Treasury shares issued under stock option plans					2	2
Common stock issued under dividend reinvestment plan	84	1,090				1,174
Balance at Dec. 31, 2012	$ 4,503	$ 35,788	$ 62,475	$ (4,050)	$ (7,082)	$ 91,634