Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2009	$ 4,746	$ 18,315	$ 36,478	$ (805)	$ (8,131)	$ 50,603
Shares, Outstanding, Beginning Balance at Dec. 31, 2009	4,337,587
Comprehensive income:
Net income			3,611			3,611
Change in unrealized gains on securities available for sale, net of reclassification adjustment and tax effects				178		178
Defined benefit retirement plan adjustments, net of tax effects				63		63
Total comprehensive income						3,852
Cash dividends			(2,627)			(2,627)
Stock-based compensation activity		36				36
Purchase of treasury stock, at cost					(1,171)	(1,171)
Treasury Stock, Shares, Acquired	(66,400)
Treasury stock issued for stock option and stock purchase plans		(19)			80	61
Stock Issued During Period, Shares, Treasury Stock Reissued	4,078
Balance at Sep. 30, 2010	4,746	18,332	37,462	(564)	(9,222)	50,754
Shares, Outstanding, Ending Balance at Sep. 30, 2010	4,275,265
Balance at Dec. 31, 2010	4,746	18,354	37,868	(1,465)	(9,527)	49,976
Shares, Outstanding, Beginning Balance at Dec. 31, 2010	4,257,765					4,257,765
Comprehensive income:
Net income			3,544			3,544
Change in unrealized gains on securities available for sale, net of reclassification adjustment and tax effects				369		369
Defined benefit retirement plan adjustments, net of tax effects				78		78
Total comprehensive income						3,991
Cash dividends			(2,716)			(2,716)
Stock-based compensation activity		19				19
Purchase of treasury stock, at cost					(417)	(417)
Treasury Stock, Shares, Acquired	(24,500)
Treasury stock issued for stock option and stock purchase plans		(10)			56	46
Stock Issued During Period, Shares, Treasury Stock Reissued	2,903
Balance at Sep. 30, 2011	$ 4,746	$ 18,363	$ 38,696	$ (1,018)	$ (9,888)	$ 50,899
Shares, Outstanding, Ending Balance at Sep. 30, 2011	4,236,168					4,236,168