Other Comprehensive Income Components (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income [Line Items]
Unrealized Holding Gains on Securities Available-for-Sale	$ 1,495	$ 11,829	$ 891
Reclassification Adjustments for (Gains) Losses Later Realized in Income	(1,667)	(3,024)	0
Net Unrealized Gains	(172)	8,805	891
Amortization of Amounts Included in Net Periodic Pension Costs	31	31	22
Unrecognized Loss on Pension	(109)	(24)	(43)
Unrecognized Gain (Loss) on Postretirement Benefits	(36)	(64)	(293)
Tax Effect	94	(3,105)	(292)
Other Comprehensive Income (Loss)	$ (192)	$ 5,643	$ 285