Policy Liabilities - Schedule of Policyholder Account Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest Sensitive Life
Policyholder Account Balance [Roll Forward]
Beginning Balance	$ 732,948	$ 739,105	$ 745,335
Issuances	0	0	0
Premiums received	20,928	22,036	23,439
Policy charges	(12,295)	(12,926)	(13,573)
Surrenders and withdrawals	(22,479)	(21,215)	(21,994)
Benefit payments	(30,512)	(29,909)	(32,889)
Interest credited	27,790	28,320	28,579
Other	7,009	7,537	10,208
Ending Balance	$ 723,389	$ 732,948	$ 739,105
Weighted-average credit rate	3.82%	3.85%	3.85%
Net amount at risk	$ 1,663,496	$ 1,766,170	$ 1,873,315
Cash surrender value	677,111	671,596	689,546
Deferred Annuity
Policyholder Account Balance [Roll Forward]
Beginning Balance	773,039	954,318	1,033,525
Issuances	875	896	1,528
Premiums received	11,332	13,209	22,873
Policy charges	0	0	0
Surrenders and withdrawals	(107,707)	(165,584)	(92,235)
Benefit payments	(43,955)	(57,937)	(44,456)
Interest credited	23,634	28,150	32,779
Other	(645)	(13)	304
Ending Balance	$ 656,573	$ 773,039	$ 954,318
Weighted-average credit rate	3.31%	3.26%	3.30%
Cash surrender value	$ 656,573	$ 773,039	$ 954,309
Other Policy-holders' Funds
Policyholder Account Balance [Roll Forward]
Beginning Balance	236,958	123,236	99,468
Issuances	0	0	0
Premiums received	240,802	122,136	30,591
Policy charges	0	0	0
Surrenders and withdrawals	(13,897)	(13,042)	(11,615)
Benefit payments	0	0	0
Interest credited	21,165	9,314	4,589
Other	(16,424)	(4,686)	203
Ending Balance	$ 468,604	$ 236,958	$ 123,236
Weighted-average credit rate	6.00%	5.17%	4.12%
Cash surrender value	$ 468,604	$ 236,958	$ 123,236