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Policyholders' Liabilities - Policyholder Account Balance (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Ending Balance $ 205,799 $ 193,291
Supplemental Contracts Without Life Contingencies    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 32,995 23,950
Policyholder Account Balance, Issuance 16,086 8,787
Policyholder Account Balance, Premium Received 85 57
Policyholder Account Balance, Interest Credited 1,103 769
Policyholder Account Balance, Other 1 2
Policyholder Account Balance, Surrender and Withdrawal 0 0
Policyholder Account Balance, Benefit Payment 8,466 2,866
Policyholder Account Balance, Ending Balance $ 41,804 $ 30,699
Weighted-average crediting rates 4.01% 4.08%
Policyholder Account Balance, Cash Surrender Value $ 41,804 $ 30,699
Fixed Annuity    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 86,807 83,917
Policyholder Account Balance, Issuance 2,160 2,343
Policyholder Account Balance, Premium Received 3,273 3,810
Policyholder Account Balance, Interest Credited 1,988 1,966
Policyholder Account Balance, Other 0 0
Policyholder Account Balance, Surrender and Withdrawal 7,647 5,903
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 86,581 $ 86,133
Weighted-average crediting rates 3.57% 3.60%
Policyholder Account Balance, Cash Surrender Value $ 86,581 $ 86,133
Dividend Accumulations    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 41,663 37,760
Policyholder Account Balance, Issuance 474 435
Policyholder Account Balance, Premium Received 4,210 4,044
Policyholder Account Balance, Interest Credited 993 897
Policyholder Account Balance, Other 0 0
Policyholder Account Balance, Surrender and Withdrawal 3,238 2,653
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 44,102 $ 40,483
Weighted-average crediting rates 3.05% 3.07%
Policyholder Account Balance, Cash Surrender Value $ 44,102 $ 40,483
Premiums Paid In Advance    
Policyholder Account Balance [Roll Forward]    
Policyholder Account Balance, Beginning Balance 34,603 38,875
Policyholder Account Balance, Issuance 3,200 1,860
Policyholder Account Balance, Premium Received 659 538
Policyholder Account Balance, Interest Credited 948 750
Policyholder Account Balance, Other 0 0
Policyholder Account Balance, Surrender and Withdrawal 6,098 6,047
Policyholder Account Balance, Benefit Payment 0 0
Policyholder Account Balance, Ending Balance $ 33,312 $ 35,976
Weighted-average crediting rates 2.96% 3.05%
Policyholder Account Balance, Cash Surrender Value $ 33,312 $ 35,976