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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ 40,367	$ (35,305)	$ (22,225)	$ (18,999)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		77,520	(13,401)	626
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	(1,848)	164	230
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		75,672	(13,237)	856
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		33,038	(33,128)	(19,779)	(12,704)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		67,802	(13,425)	(3,391)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	(1,636)	(81)	7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		66,166	(13,506)	(3,384)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(3,974)	(2,177)	(2,446)	(6,295)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(2,042)	24	4,017
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	245	245	223
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		(1,797)	269	4,240
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		11,303	0	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		11,760	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	[1]	(457)	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent		$ 11,303	$ 0	0
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				0
Accounting Standards Update 2016-01 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				(157)
Accounting Standards Update 2016-01 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				0
Accounting Standards Update 2016-01 [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				0
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				(157)
Accounting Standards Update 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption					0
Accounting Standards Update 2018-02 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				3,691
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				391
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 4,082	$ 4,082
[1] See following table for details about these reclassifications.

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