Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Capital Stock [Member]	Surplus [Member]	Undivided Profits [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2010	$ 83,166	$ 126,982	$ 108,780	$ (4,119)		$ (59,369)	$ 255,440
Comprehensive income:
Net Income	0	0	7,382	0	7,382	0	7,382
Other comprehensive income, net of tax:
Amortization of prior service cost on pension and post retirement plans, net of tax	0	0	0	0	(49)	0	0
Unrealized net holding gain (loss) on securities available-for-sale arising during the period, net of tax	0	0	0	0	165	0	0
Reclassification adjustment for net gain realized in net income during the year	0	0	0	0	(173)	0	0
Other comprehensive income, net of tax:				(57)	(57)		(57)
Comprehensive income					7,325		7,325
Cash dividend declared	0	0	(5,069)	0		0	(5,069)
Sale of treasury stock	0	(381)	0	0		1,120	739
Stock based compensation expense	0	37	0	0		0	37
Balance at Mar. 31, 2011	83,166	126,638	111,093	(4,176)		(58,249)	258,472
Balance at Dec. 31, 2011	98,912	176,638	119,465	(2,493)		(54,006)	338,516
Comprehensive income:
Net Income	0	0	8,909	0	8,909	0	8,909
Other comprehensive income, net of tax:
Amortization of prior service cost on pension and post retirement plans, net of tax	0	0	0	0	19	0	0
Unrealized net holding gain (loss) on securities available-for-sale arising during the period, net of tax	0	0	0	0	2,935	0	0
Reclassification adjustment for net gain realized in net income during the year	0	0	0	0	(408)	0	0
Other comprehensive income, net of tax:				2,546	2,546		2,546
Comprehensive income					11,455		11,455
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