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Policyholders' Liabilities - Policyholder Account Balance (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Ending Balance $ 245,619 $ 222,009
Supplemental Contracts Without Life Contingencies    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 60,414 44,569
Policyholder Account Balance, Issuance 26,548 17,642
Policyholder Account Balance, Premium Received 186 126
Policyholder Account Balance, Interest Credited 2,060 1,496
Policyholder Account Balance, Other 3  
Policyholder Account Balance, Surrender and Withdrawal 0 0
Policyholder Account Balance, Benefit Payment 9,264 6,803
Policyholder Account Balance, Ending Balance $ 79,947 $ 57,030
Weighted-average crediting rates 4.09% 4.00%
Policyholder Account Balance, Cash Surrender Value $ 79,947 $ 57,030
Fixed Annuity    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 88,080 87,134
Policyholder Account Balance, Issuance 3,312 2,132
Policyholder Account Balance, Premium Received 3,475 3,015
Policyholder Account Balance, Interest Credited 2,251 2,043
Policyholder Account Balance, Other 0  
Policyholder Account Balance, Surrender and Withdrawal 10,149 6,997
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 86,969 $ 87,327
Weighted-average crediting rates 3.97% 3.67%
Policyholder Account Balance, Cash Surrender Value $ 86,969 $ 87,327
Dividend Accumulations    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 47,768 44,960
Policyholder Account Balance, Issuance 590 598
Policyholder Account Balance, Premium Received 4,300 4,173
Policyholder Account Balance, Interest Credited 1,473 1,377
Policyholder Account Balance, Other 0  
Policyholder Account Balance, Surrender and Withdrawal 3,986 4,056
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 50,145 $ 47,052
Weighted-average crediting rates 3.87% 3.53%
Policyholder Account Balance, Cash Surrender Value $ 50,145 $ 47,052
Premiums Paid In Advance    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 29,897 31,039
Policyholder Account Balance, Issuance 3,581 4,211
Policyholder Account Balance, Premium Received 580 500
Policyholder Account Balance, Interest Credited 625 1,348
Policyholder Account Balance, Other 0  
Policyholder Account Balance, Surrender and Withdrawal 6,125 6,498
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 28,558 $ 30,600
Weighted-average crediting rates 3.23% 2.99%
Policyholder Account Balance, Cash Surrender Value $ 28,558 $ 30,600