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Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Annuities | $ 129,909 | $ 121,422 | $ 118,452
Premiums paid in advance | 35,453 | $ 36,384 | 38,437
Supplemental Contracts Without Life Contingencies |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 41,804 |  | 30,699
Fixed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 86,581 |  | 86,133
Unearned Revenue Reserve |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 1,524 |  | 1,619
Other |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 0 |  | 1
Premiums paid in advance | 2,141 |  | 2,461
Premiums Paid In Advance |  |  |
Policyholder Account Balance [Line Items] |  |  |
Premiums paid in advance | $ 33,312 |  | $ 35,976

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