Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Changes in Accumulated Other Comprehensive Income (Loss) by Component
Accumulated loss, Beginning Balance	$ (4,659)	$ (4,702)
Prior Service Cost, Beginning Balance	(15)	(24)
Unrealized Gains on Available for Sale Securities, Beginning Balance		8
Beginning Balance	(4,622)	(4,622)	(4,674)	(4,718)
Amounts reclassified from accumulated other comprehensive income, Accumulated Loss	42	85
Amounts reclassified from accumulated other comprehensive income, Prior Service Cost	10	19
Amounts reclassified from accumulated other comprehensive income, Unrealized Gains on Available for Sale Securities		(8)
Amounts reclassified from accumulated other comprehensive income, Total	52	96
Net current-period other comprehensive income, Accumulated Loss	42	85
Net current-period other comprehensive income, Prior Service Cost	10	19
Net current-period other comprehensive income, Unrealized Gains on Available for Sale Securities		(8)
Net current-period other comprehensive income, Total	52	96
Accumulated loss, Ending Balance	(4,617)	(4,617)
Prior Service Cost, Ending Balance	(5)	(5)
Unrealized Gains on Available for Sale Securities, Ending Balance
Ending Balance	$ (4,622)	$ (4,622)	$ (4,674)	$ (4,718)