Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Accumulated Net Unrealized Investment Gain (Loss)		Mar. 31, 2014 Accumulated Net Unrealized Investment Gain (Loss)		Jun. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss)		Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss)		Jun. 30, 2014 Accumulated Defined Benefit Plans Adjustment	Mar. 31, 2014 Accumulated Defined Benefit Plans Adjustment	Jun. 30, 2013 Accumulated Defined Benefit Plans Adjustment	Mar. 31, 2013 Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Beginning Balance			$ (2,888)		$ (1,295)	[1]	$ (2,860)	[1]	$ (1,307)	[1]	$ (1,707)	[1]	$ (15)	$ (28)
Other comprehensive income (loss) before reclassification					1,269	[1]	1,692	[1]	(2,224)	[1]	400	[1]	13	13	(23)
Amount reclassified from accumulated other comprehensive income (loss)						[1]	(127)	[1]	(100)	[1]		[1]
Total other comprehensive income (loss)	1,282	(2,347)	2,860	(1,947)	1,269	[1]	1,565	[1]	(2,324)	[1]	400	[1]	13	13	(23)
Ending Balance	$ (28)		$ (28)		$ (26)	[1]	$ (1,295)	[1]	$ (3,631)	[1]	$ (1,307)	[1]	$ (2)	$ (15)	$ (23)

[1] All amounts are net of tax. Amounts in parentheses indicate debits.