Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (7,027)	$ (2,386)
Other comprehensive income (loss) before reclassification adjustment	1,653	6,546
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(335)	1,128
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,318	7,674
Amounts reclassified from accumulated other comprehensive income (loss)	(374)	(10)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(50)	10
Total other comprehensive (loss) income	944	7,664
Accumulated Other Comprehensive Income (Loss), Ending Balance	(6,083)	5,278
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(7,455)	(2,956)
Other comprehensive income (loss) before reclassification adjustment	1,653	6,546
Amounts reclassified from accumulated other comprehensive income (loss)	(424)	0
Total other comprehensive (loss) income	1,229	6,546
Accumulated Other Comprehensive Income (Loss), Ending Balance	(6,226)	3,590
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	225	10
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	225	10
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	203	560
Total other comprehensive (loss) income	(285)	1,118
Accumulated Other Comprehensive Income (Loss), Ending Balance	(82)	1,678
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income	$ 944	$ 7,664