Components of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning Balance	$ (1,321)	$ (2,641)	$ (492)
Unrealized holding loss on available for sale securities net of tax	(592)	2,725	(1,716)
Reclassification adjustment, net of tax	(7)	17	(12)
Net pension loss arising during the period, net of tax	(752)	(1,356)	(348)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(66)	(66)	(73)
Ending Balance	(2,738)	(1,321)	(2,641)
Tax, Parenthetical Disclosures [Abstract]
Tax on unrealized holding loss on available for sale securities	(320)	1,468	(923)
Tax on reclassification adjustment	(3)	9	(7)
Tax on net pension loss arising during the period,	(405)	(731)	(188)
Tax on amortization of prior service cost included in net periodic pension cost	(35)	(35)	(39)
Net Unrealized Gain (Loss) on Securities [Member]
Beginning Balance	2,646	(96)	1,632
Unrealized holding loss on available for sale securities net of tax	(592)	2,725	(1,716)
Reclassification adjustment, net of tax	(7)	17	(12)
Net pension loss arising during the period, net of tax	0	0	0
Less amortization of prior service cost included in net periodic pension cost, net of tax	0	0	0
Ending Balance	2,047	2,646	(96)
Adjustments Related to Pension Benefits [Member]
Beginning Balance	(3,967)	(2,545)	(2,124)
Unrealized holding loss on available for sale securities net of tax	0	0	0
Reclassification adjustment, net of tax	0	0	0
Net pension loss arising during the period, net of tax	(752)	(1,356)	(348)
Less amortization of prior service cost included in net periodic pension cost, net of tax	(66)	(66)	(73)
Ending Balance	$ (4,785)	$ (3,967)	$ (2,545)