Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Accumulated loss, Beginning Balance	$ (4,702)
Prior Service Cost, Beginning Balance	(24)
Unrealized Gains on Available for Sale Securities, Beginning Balance	8
Beginning Balance	(4,674)	(4,718)
Other comprehensive income before reclassifications, Accumulated Loss
Other comprehensive income before reclassifications, Prior Service Cost
Other comprehensive income before reclassifications, Unrealized Gains on Available for Sale Securities
Other comprehensive income before reclassifications, Total
Amounts reclassified from accumulated other comprehensive income, Accumulated Loss	43
Amounts reclassified from accumulated other comprehensive income, Prior Service Cost	9
Amounts reclassified from accumulated other comprehensive income, Unrealized Gains on Available for Sale Securities	(8)
Amounts reclassified from accumulated other comprehensive income, Total	44
Net current-period other comprehensive income (loss), Accumulated Loss	43
Net current-period other comprehensive income (loss), Prior Service Cost	(9)
Net current-period other comprehensive income (loss), Unrealized Gains on Available for Sale Securities	(8)
Net current-period other comprehensive income (loss)	44
Accumulated loss, Ending Balance	(4,659)
Prior Service Cost, Ending Balance	(15)
Unrealized Gains on Available for Sale Securities, Ending Balance
Ending Balance	$ (4,674)	$ (4,718)