Assets and Liabilities Measured at Fair Value - Summary of Changes in Fair Value of Level 3 Assets Held at Fair Value on Recurring Basis (Details) - Fixed Maturities, Available-for-Sale - Level 3 - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Financial Assets, Beginning Balance	$ 28,076	$ 10,255
Total gains (losses) included in: Net Income (loss)	564	(39)
Total gains (losses) included in: OCI	(517)	(25)
Purchases	1,215	20,163
Sales	(682)
Settlements	(1,233)	(265)
Net Transfers	3,838	(2,013)
Financial Assets, Ending Balance	31,261	28,076
State and Political Subdivisions
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Financial Assets, Beginning Balance	498	521
Total gains (losses) included in: OCI	(41)	(23)
Financial Assets, Ending Balance	457	498
Corporate and Miscellaneous
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Financial Assets, Beginning Balance	24,740	8,433
Total gains (losses) included in: Net Income (loss)	554	(39)
Total gains (losses) included in: OCI	(306)
Purchases	1,086	18,873
Sales	(27)
Settlements	(1,005)	(14)
Net Transfers	2,884	(2,513)
Financial Assets, Ending Balance	27,926	24,740
Asset-backed
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Financial Assets, Beginning Balance	2,838	1,301
Total gains (losses) included in: Net Income (loss)	10
Total gains (losses) included in: OCI	(170)	(2)
Purchases	129	1,290
Sales	(655)
Settlements	(228)	(251)
Net Transfers	954	500
Financial Assets, Ending Balance	$ 2,878	$ 2,838