Policy Liabilities - Schedule of Policyholder Account Balance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest Sensitive Life
Policyholder Account Balance [Roll Forward]
Beginning Balance	$ 728,097	$ 736,920	$ 732,948	$ 739,105
Issuances	0	0	0	0
Premiums received	5,077	5,398	16,187	17,062
Policy charges	(3,081)	(3,213)	(9,253)	(9,729)
Surrenders and withdrawals	(5,850)	(5,582)	(17,326)	(16,204)
Benefit payments	(6,617)	(7,258)	(23,357)	(22,753)
Interest credited	6,922	7,083	20,890	21,274
Other	1,309	1,677	5,768	6,270
Ending Balance	$ 725,857	$ 735,025	$ 725,857	$ 735,025
Weighted-average credit rate	3.86%	3.91%	3.86%	3.91%
Net amount at risk	$ 1,687,182	$ 1,793,787	$ 1,687,182	$ 1,793,787
Cash surrender value	678,556	673,814	678,556	673,814
Deferred Annuity
Policyholder Account Balance [Roll Forward]
Beginning Balance	706,022	853,064	773,039	954,318
Issuances	137	231	495	602
Premiums received	2,448	2,439	8,857	10,543
Policy charges	0	0	0	0
Surrenders and withdrawals	(22,331)	(37,905)	(84,893)	(125,176)
Benefit payments	(10,022)	(11,047)	(34,159)	(48,459)
Interest credited	5,777	6,863	17,990	21,608
Other	(1,182)	(370)	(480)	(161)
Ending Balance	$ 680,849	$ 813,275	$ 680,849	$ 813,275
Weighted-average credit rate	3.37%	3.34%	3.37%	3.34%
Cash surrender value	$ 680,849	$ 813,276	$ 680,849	$ 813,276
Other Policy-holders' Funds
Policyholder Account Balance [Roll Forward]
Beginning Balance	400,625	187,873	236,958	123,234
Issuances	0	0	0	0
Premiums received	70,644	31,704	239,114	100,113
Policy charges	0	0	0	0
Surrenders and withdrawals	(3,264)	(2,782)	(10,615)	(9,106)
Benefit payments	0	0	0	0
Interest credited	6,106	2,825	15,210	6,164
Other	(4,823)	(1,410)	(11,379)	(2,195)
Ending Balance	$ 469,288	$ 218,210	$ 469,288	$ 218,210
Weighted-average credit rate	5.73%	5.68%	5.73%	5.68%
Cash surrender value	$ 469,288	$ 218,210	$ 469,288	$ 218,210