Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2009	$ 2,036	$ 10,221	$ 44,922	$ 1,723	$ (2,476)	$ 56,426
Balance, shares at Dec. 31, 2009	3,093,225
Comprehensive income:
Net income			7,217			7,217
Other comprehensive income, net of tax				(184)		(184)
Total comprehensive income, net of tax						7,033
Cash dividends declared			(2,982)			(2,982)
Stock issued in connection with dividend reinvestment and stock purchase plan	16	457				473
Stock issued in connection with dividend reinvestment and stock purchase plan - shares	25,317
Stock issued for employee stock purchase plan	3	65				68
Stock issued for employee stock purchase plan - Shares	4,118
Stock issued for options exercised	4	14				18
Stock issued for options exercised - Shares	6,458
Tax benefit of stock options exercised		3				3
Stock-based compensation expense		51				51
Balance at Dec. 31, 2010	2,059	10,811	49,157	1,539	(2,476)	61,090
Balance, shares at Dec. 31, 2010	3,129,118					3,129,118
Comprehensive income:
Net income			8,880			8,880
Other comprehensive income, net of tax				3,126		3,126
Total comprehensive income, net of tax						12,006
Cash dividends declared			(3,151)			(3,151)
Stock issued in connection with dividend reinvestment and stock purchase plan	21	696				717
Stock issued in connection with dividend reinvestment and stock purchase plan - shares	33,832
Stock issued for employee stock purchase plan	2	69				71
Stock issued for employee stock purchase plan - Shares	3,786
Stock issued for options exercised	5	12				17
Stock issued for options exercised - Shares	7,509
Tax benefit of stock options exercised		32				32
Stock-based compensation expense		59				59
Balance at Dec. 31, 2011	$ 2,087	$ 11,679	$ 54,886	$ 4,665	$ (2,476)	$ 70,841
Balance, shares at Dec. 31, 2011	3,174,245					3,174,245