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Policyholders' Liabilities - Policyholders' Account Balance Reconciliation to Policyholders' Account Balances' Liability (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Policyholder Account Balance [Line Items] |  |  |
Annuities | $ 168,396 | $ 149,977 | $ 145,838
Premiums paid in advance | 30,628 | $ 31,182 | 32,420
Supplemental Contracts Without Life Contingencies |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 79,947 |  | 57,030
Fixed Annuity |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 86,969 |  | 87,327
Unearned Revenue Reserve |  |  |
Policyholder Account Balance [Line Items] |  |  |
Annuities | 1,480 |  | 1,481
Premiums Paid In Advance |  |  |
Policyholder Account Balance [Line Items] |  |  |
Premiums paid in advance | 28,558 |  | 30,600
Other |  |  |
Policyholder Account Balance [Line Items] |  |  |
Premiums paid in advance | $ 2,070 |  | $ 1,820

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