Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands	Capital Stock [Member]	Surplus [Member]	Undivided Profits [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 98,927	$ 173,144	$ 147,432	$ (13,803)	$ (43,887)	$ 361,813
Net Income	0	0	11,011	0	0	11,011
Other comprehensive income (loss), net of tax	0	0	0	4,351	0	4,351
Cash dividend declared	0	0	(6,206)	0	0	(6,206)
Sale of treasury stock	0	(267)	0	0	990	723
Stock based compensation expense	0	87	0	0	0	87
Balance at Mar. 31, 2014	98,927	172,964	152,237	(9,452)	(42,897)	371,779
Balance at Dec. 31, 2014	98,945	172,353	166,745	(4,509)	(40,090)	393,444
Net Income	0	0	10,715	0	0	10,715
Other comprehensive income (loss), net of tax	0	0	0	1,822	0	1,822
Cash dividend declared	0	0	(6,228)	0	0	(6,228)
Stock options exercised and related tax benefits	19	80	0	0	0	99
Purchase of treasury stock	0	0	0	0	(99)	(99)
Sale of treasury stock	0	(244)	0	0	919	675
Stock based compensation expense	0	48	0	0	0	48
Balance at Mar. 31, 2015	$ 98,964	$ 172,237	$ 171,232	$ (2,687)	$ (39,270)	$ 400,476