Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Capital Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 9,051	$ 26,165	$ 80,379	$ 284	$ (12,271)	$ 103,608
Net income			8,652			8,652
Total other comprehensive income				6,695		6,695
Dividend declared:
Common stock			(3,142)			(3,142)
Purchase of treasury stock (10,794 shares)					(304)	(304)
Stock options exercised, including related tax effects		246	(989)		2,330	1,587
Recognition of stock based compensation expense		77				77
Balance at Sep. 30, 2011	9,051	26,488	84,900	6,979	(10,245)	117,173
Balance at Dec. 31, 2011	9,051	26,512	86,198	7,024	(10,535)	118,250
Net income			9,636			9,636
Total other comprehensive income				3,558		3,558
Dividend declared:
Common stock			(3,388)			(3,388)
Stock options exercised, including related tax effects		28	(197)		1,168	999
Recognition of stock based compensation expense		160	20			180
Restricted stock grants		(49)	8		41
Balance at Sep. 30, 2012	$ 9,051	$ 26,651	$ 92,277	$ 10,582	$ (9,326)	$ 129,235