Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Annuities	$ 133,216	$ 121,422
Premiums paid in advance	32,446	36,384
Supplemental Contracts Without Life Contingencies
Policyholder Account Balance [Line Items]
Annuities	44,569	32,995
Fixed Annuity
Policyholder Account Balance [Line Items]
Annuities	87,134	86,807
Unearned Revenue Reserve
Policyholder Account Balance [Line Items]
Annuities	1,513	1,619
Other
Policyholder Account Balance [Line Items]
Annuities	0	1
Premiums paid in advance	1,407	1,781
Premiums Paid In Advance
Policyholder Account Balance [Line Items]
Premiums paid in advance	$ 31,039	$ 34,603