Components of Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Beginning Balance	$ (2,738)	$ (1,321)
Unrealized holding loss on available for sale securities net of tax	(903)	(907)
Reclassification adjustment, net of tax	(62)	(29)
Ending Balance	(3,703)	(2,257)
Tax, Parenthetical Disclosures [Abstract]
Tax on unrealized holding loss on available for sale securities	(487)	(489)
Tax on reclassification adjustment	(33)	(15)
Net Unrealized Gain (Loss) on Securities [Member]
Beginning Balance	2,047	2,646
Unrealized holding loss on available for sale securities net of tax	(903)	(907)
Reclassification adjustment, net of tax	(62)	(29)
Ending Balance	1,082	1,710
Adjustments Related to Pension Benefits [Member]
Beginning Balance	(4,785)	(3,967)
Unrealized holding loss on available for sale securities net of tax	0	0
Reclassification adjustment, net of tax	0	0
Ending Balance	$ (4,785)	$ (3,967)