Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Policyholder Account Balance [Line Items]
Annuities	$ 141,603	$ 133,216	$ 127,485
Premiums paid in advance	32,737	$ 32,446	36,432
Supplemental Contracts Without Life Contingencies
Policyholder Account Balance [Line Items]
Annuities	53,332		39,393
Fixed Annuity
Policyholder Account Balance [Line Items]
Annuities	86,792		86,558
Unearned Revenue Reserve
Policyholder Account Balance [Line Items]
Annuities	1,479		1,534
Premiums Paid In Advance
Policyholder Account Balance [Line Items]
Premiums paid in advance	30,627		33,820
Other
Policyholder Account Balance [Line Items]
Premiums paid in advance	$ 2,110		$ 2,612