Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (2,386)	$ (4,499)
Other comprehensive income (loss) before reclassification adjustment	6,546	6,489
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	1,128	777
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	7,674	7,266
Amounts reclassified from accumulated other comprehensive income (loss)	(10)	(65)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	10	(3)
Total other comprehensive (loss) income	7,664	7,201
Accumulated Other Comprehensive Income (Loss), Ending Balance	5,278	2,702
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(2,956)	(4,875)
Other comprehensive income (loss) before reclassification adjustment	6,546	6,489
Amounts reclassified from accumulated other comprehensive income (loss)	0	(68)
Total other comprehensive (loss) income	6,546	6,421
Accumulated Other Comprehensive Income (Loss), Ending Balance	3,590	1,546
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	10	76
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	10	76
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	560	300
Total other comprehensive (loss) income	1,118	780
Accumulated Other Comprehensive Income (Loss), Ending Balance	1,678	1,080
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income	$ 7,664	$ 7,201