Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Comprehensive Income [Line Items]
Reclassifications from accumulated other comprehensive income, net of tax			$ (5)	$ (71)
Current period change in other comprehensive income, net of tax	(1,648)	(625)	6,500	(14,919)
Reclassifications from accumulated other comprehensive income, net of tax			(102)	(715)
Current period change in other comprehensive income, net of tax	(48)	(158)	(102)	(715)
Beginning Balance			(2,970)	11,312
Other comprehensive income before reclassification, net of tax			6,495	(14,990)
Reclassifications from accumulated other comprehensive income, net of tax			107	786
Current period change in other comprehensive income, net of tax			6,602	(14,204)
Ending Balance	3,632	(2,892)	3,632	(2,892)
Unrealized Gains (Losses) on Investments Available-for-Sale
Comprehensive Income [Line Items]
Beginning Balance			358	20,258
Other comprehensive income before reclassification, net of tax			6,495	(14,990)
Reclassifications from accumulated other comprehensive income, net of tax			5	71
Current period change in other comprehensive income, net of tax			6,500	(14,919)
Ending Balance	6,858	5,339	6,858	5,339
Accumulated Defined Benefit Plans Adjustment [Member]
Comprehensive Income [Line Items]
Beginning Balance			(3,328)	(8,946)
Reclassifications from accumulated other comprehensive income, net of tax			102	715
Current period change in other comprehensive income, net of tax			102	715
Ending Balance	$ (3,226)	$ (8,231)	$ (3,226)	$ (8,231)