Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Capital Stock [Member]	Surplus [Member]	Undivided Profits [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2011	$ 98,912	$ 176,638	$ 119,465	$ (2,493)	$ (54,006)	$ 338,516
Net Income	0	0	8,909	0	0	8,909
Change in other comprehensive income, net of tax	0	0	0	2,546	0	2,546
Cash dividend declared	0	0	(6,139)	0	0	(6,139)
Sale of treasury stock	0	(529)	0	0	1,253	724
Stock based compensation expense	0	90	0	0	0	90
Balance at Mar. 31, 2012	98,912	176,199	122,235	53	(52,753)	344,646
Balance at Dec. 31, 2012	98,912	174,899	132,378	1,558	(48,949)	358,798
Net Income	0	0	9,168	0	0	9,168
Change in other comprehensive income, net of tax	0	0	0	(1,727)	0	(1,727)
Cash dividend declared	0	0	(6,173)	0	0	(6,173)
Sale of treasury stock	0	(601)	0	0	1,336	735
Stock based compensation expense	0	88	0	0	0	88
Balance at Mar. 31, 2013	$ 98,912	$ 174,386	$ 135,373	$ (169)	$ (47,613)	$ 360,889