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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
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