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Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Annuities | $ 158,034 | $ 149,977 | $ 136,965
Premiums paid in advance | 31,964 | $ 31,182 | 32,391
Supplemental Contracts Without Life Contingencies |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 67,838 |  | 48,670
Fixed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 88,708 |  | 86,804
Unearned Revenue Reserve |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 1,488 |  | 1,491
Premiums Paid In Advance |  |  |
Policyholder Account Balance [Line Items] |  |  |
Premiums paid in advance | 29,973 |  | 30,481
Other |  |  |
Policyholder Account Balance [Line Items] |  |  |
Premiums paid in advance | $ 1,991 |  | $ 1,910

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