Assets and Liabilities Measured at Fair Value - Summary of Carrying Amount and Estimated Fair Values of Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Carrying Value
Financial instruments recorded as assets:
Mortgage loans	$ 47,547	$ 47,487
Policyholder loans	6,600	6,371
Financial instruments recorded as liabilities:
Future policy benefits, excluding term life reserves	18,117	22,680
Long/short-term debt	32,997	26,378
Policyholder account balances	79,286	80,494
Estimated Fair Value
Financial instruments recorded as assets:
Mortgage loans	43,987	43,047
Policyholder loans	8,579	8,280
Financial instruments recorded as liabilities:
Future policy benefits, excluding term life reserves	16,286	19,733
Long/short-term debt	34,093	31,940
Policyholder account balances	74,396	86,198
Estimated Fair Value | Level 3
Financial instruments recorded as assets:
Mortgage loans	43,987	43,047
Policyholder loans	8,579	8,280
Financial instruments recorded as liabilities:
Future policy benefits, excluding term life reserves	16,286	19,733
Long/short-term debt	34,093	31,940
Policyholder account balances	$ 74,396	$ 86,198