Supplemental Comprehensive Income Disclosures (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 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	$ 1,099	$ (489)	3,858	8,528
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(32)	(686)	(410)	675
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			3,448	9,203
Amounts reclassified from accumulated other comprehensive income (loss)			(392)	(55)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(13)	10	(60)	37
Total other comprehensive (loss) income	1,020	(1,185)	3,056	9,148
Accumulated Other Comprehensive Income (Loss), Ending Balance	(3,971)	6,762	(3,971)	6,762
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			3,858	8,528
Amounts reclassified from accumulated other comprehensive income (loss)			(452)	(18)
Total other comprehensive (loss) income			3,406	8,510
Accumulated Other Comprehensive Income (Loss), Ending Balance	(4,049)	5,554	(4,049)	5,554
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	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			(350)	638
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (147)	$ 1,198	(147)	1,198
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income			$ 3,056	$ 9,148