Policyholders' Liabilities - Policyholder Account Balance (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, Ending Balance	$ 222,009	$ 205,799
Supplemental Contracts Without Life Contingencies
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, Beginning Balance	44,569	32,995
Policyholder Account Balance, Issuance	17,642	16,086
Policyholder Account Balance, Premium Received	126	85
Policyholder Account Balance, Interest Credited	1,496	1,103
Policyholder Account Balance, Other		1
Policyholder Account Balance, Surrender and Withdrawal	0	0
Policyholder Account Balance, Benefit Payment	6,803	8,466
Policyholder Account Balance, Ending Balance	$ 57,030	$ 41,804
Weighted-average crediting rates	4.00%	4.01%
Policyholder Account Balance, Cash Surrender Value	$ 57,030	$ 41,804
Fixed Annuity
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, Beginning Balance	87,134	86,807
Policyholder Account Balance, Issuance	2,132	2,160
Policyholder Account Balance, Premium Received	3,015	3,273
Policyholder Account Balance, Interest Credited	2,043	1,988
Policyholder Account Balance, Other		0
Policyholder Account Balance, Surrender and Withdrawal	6,997	7,647
Policyholder Account Balance, Benefit Payment	0	0
Policyholder Account Balance, Ending Balance	$ 87,327	$ 86,581
Weighted-average crediting rates	3.67%	3.57%
Policyholder Account Balance, Cash Surrender Value	$ 87,327	$ 86,581
Dividend Accumulations
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, Beginning Balance	44,960	41,663
Policyholder Account Balance, Issuance	598	474
Policyholder Account Balance, Premium Received	4,173	4,210
Policyholder Account Balance, Interest Credited	1,377	993
Policyholder Account Balance, Other		0
Policyholder Account Balance, Surrender and Withdrawal	4,056	3,238
Policyholder Account Balance, Benefit Payment	0	0
Policyholder Account Balance, Ending Balance	$ 47,052	$ 44,102
Weighted-average crediting rates	3.53%	3.05%
Policyholder Account Balance, Cash Surrender Value	$ 47,052	$ 44,102
Premiums Paid In Advance
Policyholder Account Balance [Roll Forward]
Policyholder Account Balance, Beginning Balance	31,039	34,603
Policyholder Account Balance, Issuance	4,211	3,200
Policyholder Account Balance, Premium Received	500	659
Policyholder Account Balance, Interest Credited	1,348	948
Policyholder Account Balance, Other		0
Policyholder Account Balance, Surrender and Withdrawal	6,498	6,098
Policyholder Account Balance, Benefit Payment	0	0
Policyholder Account Balance, Ending Balance	$ 30,600	$ 33,312
Weighted-average crediting rates	2.99%	2.96%
Policyholder Account Balance, Cash Surrender Value	$ 30,600	$ 33,312