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, 2010	$ 83,166	$ 126,982	$ 108,780	$ (4,119)	$ (59,369)	$ 255,440
Net Income	0	0	15,148	0	0	15,148
Change in other comprehensive income, net of tax				6,965		6,965
Cash dividend declared	0	0	(10,146)	0	0	(10,146)
Sale of treasury stock	0	(860)	0	0	2,328	1,468
Stock based compensation expense	0	74	0	0	0	74
Balance at Jun. 30, 2011	83,166	126,196	113,782	2,846	(57,041)	268,949
Balance at Dec. 31, 2011	98,912	176,638	119,465	(2,493)	(54,006)	338,516
Net Income	0	0	17,975	0	0	17,975
Change in other comprehensive income, net of tax				4,078		4,078
Cash dividend declared	0	0	(12,287)	0	0	(12,287)
Sale of treasury stock	0	(1,044)	0	0	2,490	1,446
Stock based compensation expense	0	179	0	0	0	179
Balance at Jun. 30, 2012	$ 98,912	$ 175,773	$ 125,153	$ 1,585	$ (51,516)	$ 349,907