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, 2012	$ 98,912	$ 174,899	$ 132,378	$ 1,558	$ (48,949)	$ 358,798
Net Income	0	0	18,931	0	0	18,931
Other comprehensive income (loss), net of tax	0	0	0	(18,389)	0	(18,389)
Cash dividend declared	0	0	(12,356)	0	0	(12,356)
Sale of treasury stock	0	(1,173)	0	0	2,641	1,468
Stock based compensation expense	0	171	0	0	0	171
Balance at Jun. 30, 2013	98,912	173,897	138,953	(16,831)	(46,308)	348,623
Balance at Dec. 31, 2013	98,927	173,144	147,432	(13,803)	(43,887)	361,813
Net Income	0	0	22,819	0	0	22,819
Other comprehensive income (loss), net of tax	0	0	0	11,192	0	11,192
Cash dividend declared	0	0	(12,419)	0	0	(12,419)
Sale of treasury stock	0	(548)	0	0	1,987	1,439
Stock based compensation expense	0	173	0	0	0	173
Balance at Jun. 30, 2014	$ 98,927	$ 172,769	$ 157,832	$ (2,611)	$ (41,900)	$ 385,017