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Policyholders' Liabilities - Policyholder Account Balance (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Ending Balance $ 235,112 $ 211,715
Supplemental Contracts Without Life Contingencies    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 60,414 44,569
Policyholder Account Balance, Issuance 9,719 5,721
Policyholder Account Balance, Premium Received 39 27
Policyholder Account Balance, Interest Credited 655 474
Policyholder Account Balance, Surrender and Withdrawal 0 0
Policyholder Account Balance, Benefit Payment 2,989 2,121
Policyholder Account Balance, Ending Balance $ 67,838 $ 48,670
Weighted-average crediting rates 4.08% 3.96%
Policyholder Account Balance, Cash Surrender Value $ 67,838 $ 48,670
Fixed Annuity    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 88,080 87,134
Policyholder Account Balance, Issuance 1,001 594
Policyholder Account Balance, Premium Received 1,135 985
Policyholder Account Balance, Interest Credited 759 663
Policyholder Account Balance, Surrender and Withdrawal 2,267 2,572
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 88,708 $ 86,804
Weighted-average crediting rates 3.97% 3.57%
Policyholder Account Balance, Cash Surrender Value $ 88,708 $ 86,804
Dividend Accumulations    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 47,768 44,960
Policyholder Account Balance, Issuance 183 138
Policyholder Account Balance, Premium Received 1,416 1,358
Policyholder Account Balance, Interest Credited 454 472
Policyholder Account Balance, Surrender and Withdrawal 1,228 1,168
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 48,593 $ 45,760
Weighted-average crediting rates 3.78% 3.28%
Policyholder Account Balance, Cash Surrender Value $ 48,593 $ 45,760
Premiums Paid In Advance    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 29,897 31,039
Policyholder Account Balance, Issuance 1,249 806
Policyholder Account Balance, Premium Received 212 194
Policyholder Account Balance, Interest Credited 222 431
Policyholder Account Balance, Surrender and Withdrawal 1,607 1,989
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 29,973 $ 30,481
Weighted-average crediting rates 3.19% 2.93%
Policyholder Account Balance, Cash Surrender Value $ 29,973 $ 30,481