Supplemental Comprehensive Income Disclosures - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ 5,579
Other comprehensive income (loss) before reclassification adjustment	15,407	$ 7,134
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(3,619)	105
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0
Total other comprehensive (loss) income	11,773	7,239
Accumulated Other Comprehensive Income (Loss), Ending Balance	17,352
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	4,580	(11,697)
Other comprehensive income (loss) before reclassification adjustment	15,407	7,134
Amounts reclassified from accumulated other comprehensive income (loss)	(15)	0
Total other comprehensive (loss) income	15,392	7,134
Accumulated Other Comprehensive Income (Loss), Ending Balance	19,972	(4,563)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	365	461
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	365	461
Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	634	(105)
Total other comprehensive (loss) income	(3,619)	105
Accumulated Other Comprehensive Income (Loss), Ending Balance	(2,985)	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	5,579	(11,341)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	11,788	7,239
Amounts reclassified from accumulated other comprehensive income (loss)	(15)	0
Total other comprehensive (loss) income	11,773	7,239
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ 17,352	$ (4,102)