Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for losses (gains) included in net income (loss)	$ 24		$ (24)		$ 62	$ 35
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(20,406)		(119,555)		23,068	(252,261)
Change in current discount rate for liability for future policy benefits	6,251		120,437		(14,229)	272,044
Income tax expense (benefit) on other comprehensive income items	(1,257)		4,634		158	6,346
Other comprehensive income (loss)	(12,898)	$ 21,579	(3,752)	$ 17,189	8,681	13,437
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding gains (losses) arising during period	(20,430)		(119,531)		23,006	(252,296)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	(1,111)		(4,435)		1,169	(13,392)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	(19,319)		(115,096)		21,837	(238,904)
Reclassification adjustment for losses (gains) included in net income (loss)	24		(24)		62	35
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(5)		5		(13)	(7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	19		(19)		49	28
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(20,406)		(119,555)		23,068	(252,261)
Income tax expense (benefit) on other comprehensive income items	(1,106)		(4,440)		1,182	(13,385)
Unrealized investment gains (losses), net	(19,300)		(115,115)		21,886	(238,876)
Change in current discount rate for liability for future policy benefits	6,251		120,437		(14,229)	272,044
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax	(151)		9,074		(1,024)	19,731
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax	6,402		111,363		(13,205)	252,313
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(14,155)		882		8,839	19,783
Income tax expense (benefit) on other comprehensive income items	(1,257)		4,634		158	6,346
Other comprehensive income (loss)	$ (12,898)		$ (3,752)		$ 8,681	$ 13,437