Supplemental Comprehensive Income Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (4,499)	$ (20,588)
Other comprehensive income (loss) before reclassification adjustment	6,489	8,096
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	7,266	8,096
Amounts reclassified from accumulated other comprehensive income (loss)	(65)	0
Total other comprehensive (loss) income	7,201	8,096
Accumulated Other Comprehensive Income (Loss), Ending Balance	2,702	(12,492)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(4,875)	(20,868)
Other comprehensive income (loss) before reclassification adjustment	6,489	8,096
Amounts reclassified from accumulated other comprehensive income (loss)	(68)	0
Total other comprehensive (loss) income	6,421	8,096
Accumulated Other Comprehensive Income (Loss), Ending Balance	1,546	(12,772)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	300	280
Other comprehensive income (loss) before reclassification adjustment	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive (loss) income	0	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	300	280
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	76	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	777	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(3)	0
Total other comprehensive (loss) income	780	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	856	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income	$ 7,201	$ 8,096