Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax
Unrealized holding gains (losses) arising during the period. before tax	$ 84,010	$ 78,744	$ (34,357)
Unrealized holding gains (losses) arising during the period, tax effect	(6,044)	(5,535)	6,520
Unrealized holding gains (losses) arising during the period, net of tax	77,966	73,209	(27,837)
Reclassification adjustment for (gains) losses included in net income	111	(1,927)	(953)
Reclassification adjustment for (gains) losses included in net income, tax effect	(23)	405	200
Reclassification adjustment for (gains) losses included in net income, net of tax	88	(1,522)	(753)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax			3,588
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax			(218)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax			3,370
Other Comprehensive Income (Loss), Effects of Deferred Policy Acquisition Cost, before Tax, Portion Attributable to Parent	(37,372)	(484)	223
Other Comprehensive Income (Loss), Effects of Deferred Policy Acquisition Costs , Tax	8,872	102	(123)
Other Comprehensive Income (Loss), Effects of Deferred Policy Acquisition Costs, Net of Tax	(28,500)	(382)	100
Other Comprehensive Income (Loss), Effect of Cost of Insurance Acquired before Tax	(98)	(224)	184
Other Comprehensive Income, Effects of Cost of Insurance Acquired, Tax	21	47	(87)
Other Comprehensive Income (Loss), Effects of Cost of Insurance Acquired, Net of Tax	(77)	(177)	97
Other Comprehensive Income, Effect of Future Policy Benefit Reserves before Tax	2,102	789	(277)
Other Comprehensive Income (Loss), Effects of Future Policy Benefit Reserves, Tax	(441)	(166)	172
Other Comprehensive Income (Loss), Effects of Future Policy Benefit Reserves, Net of Tax	1,661	623	(105)
Unrealized gains (losses) arising during period, net	48,753	76,898	(31,592)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	2,385	(5,147)	6,464
Other comprehensive income (loss)	51,138	71,751	(25,128)
Unrealized holding gains arising during period less Effects of DAC and CCRA, before tax	$ 48,642	$ 78,825
Unrealized Holding Losses Arising During the Period Less Effects of DAC and CCRA, Before Tax			$ (30,639)