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Policy Liabilities - Schedule of Policyholder Account Balance, Guaranteed Minimum Crediting Rate (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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1-50 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range above guaranteed minimum crediting rates | 0.0001 |  |  | 0.0001 |  |
1-50 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range above guaranteed minimum crediting rates | 0.0050 |  |  | 0.0050 |  |
51-150 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range above guaranteed minimum crediting rates | 0.0051 |  |  | 0.0051 |  |
51-150 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range above guaranteed minimum crediting rates | 0.0150 |  |  | 0.0150 |  |
Interest Sensitive Life |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 714,012 | $ 717,140 | $ 723,389 | $ 725,857 | $ 728,097 | $ 732,948
Interest Sensitive Life | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 714,012 |  |  | 725,857 |  |
Interest Sensitive Life | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Interest Sensitive Life | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | Less than 3.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | Less than 3.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | Less than 3.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 29,433 |  |  | $ 29,170 |  |
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Interest Sensitive Life | 3.00%-3.99% | At guaranteed minimum | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.99% |  |  | 3.99% |  |
Interest Sensitive Life | 3.00%-3.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | 3.00%-3.99% | 1-50 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Interest Sensitive Life | 3.00%-3.99% | 1-50 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.99% |  |  | 3.99% |  |
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.00% |  |  | 3.00% |  |
Interest Sensitive Life | 3.00%-3.99% | 51-150 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3.99% |  |  | 3.99% |  |
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 595,212 |  |  | $ 606,425 |  |
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.00% |  |  | 4.00% |  |
Interest Sensitive Life | 4.00%-4.99% | At guaranteed minimum | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.99% |  |  | 4.99% |  |
Interest Sensitive Life | 4.00%-4.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | 4.00%-4.99% | 1-50 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.00% |  |  | 4.00% |  |
Interest Sensitive Life | 4.00%-4.99% | 1-50 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.99% |  |  | 4.99% |  |
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above | Minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.00% |  |  | 4.00% |  |
Interest Sensitive Life | 4.00%-4.99% | 51-150 basis points above | Maximum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 4.99% |  |  | 4.99% |  |
Interest Sensitive Life | Greater than 5.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 5.00% |  |  | 5.00% |  |
Range of guaranteed minimum crediting rates | $ 89,367 |  |  | $ 90,262 |  |
Interest Sensitive Life | Greater than 5.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 5.00% |  |  | 5.00% |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Interest Sensitive Life | Greater than 5.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 5.00% |  |  | 5.00% |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |
Deferred Annuity |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 595,506 | 615,897 | 656,573 | 680,849 | 706,022 | 773,039
Amount reinsured with third-party reinsurers under existing reinsurance agreements | 411,000 |  |  |  |  |
Deferred Annuity | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 595,506 |  |  | 680,849 |  |
Deferred Annuity | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | Less than 3.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 2,181 |  |  | 1,866 |  |
Deferred Annuity | Less than 3.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | Less than 3.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | 3.00%-3.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 419,069 |  |  | 494,585 |  |
Deferred Annuity | 3.00%-3.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | 3.00%-3.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | 4.00%-4.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 174,256 |  |  | 184,398 |  |
Deferred Annuity | 4.00%-4.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | 4.00%-4.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | Greater than 5.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | Greater than 5.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Deferred Annuity | Greater than 5.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 522,133 | $ 492,146 | $ 468,604 | 469,288 | $ 400,625 | $ 236,958
Other Policy-holders' Funds | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 522,133 |  |  | 419,864 |  |
Other Policy-holders' Funds | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 1,678 |  |
Other Policy-holders' Funds | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 47,746 |  |
Other Policy-holders' Funds | Less than 3.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 428,558 |  |  | 373,729 |  |
Other Policy-holders' Funds | Less than 3.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds | Less than 3.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds | 3.00%-3.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 3,100 |  |  | 3,046 |  |
Other Policy-holders' Funds | 3.00%-3.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds | 3.00%-3.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds | 4.00%-4.99% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 55,168 |  |  | 6,548 |  |
Other Policy-holders' Funds | 4.00%-4.99% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 1,678 |  |
Other Policy-holders' Funds | 4.00%-4.99% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 47,746 |  |
Other Policy-holders' Funds | Greater than 5.00% | At guaranteed minimum |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 35,307 |  |  | 36,541 |  |
Other Policy-holders' Funds | Greater than 5.00% | 1-50 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | 0 |  |  | 0 |  |
Other Policy-holders' Funds | Greater than 5.00% | 51-150 basis points above |  |  |  |  |  |
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] |  |  |  |  |  |
Range of guaranteed minimum crediting rates | $ 0 |  |  | $ 0 |  |

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