Policy Liabilities - Schedule of Policyholder Account Balance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest Sensitive Life
Policyholder Account Balance [Roll Forward]
Beginning Balance	$ 729,721	$ 737,900	$ 732,948	$ 739,105
Issuances	0	0	0	0
Premiums received	5,486	5,634	11,110	11,664
Policy charges	(3,061)	(3,197)	(6,172)	(6,516)
Surrenders and withdrawals	(5,167)	(5,238)	(11,476)	(10,622)
Benefit payments	(7,600)	(7,651)	(16,740)	(15,495)
Interest credited	6,952	7,056	13,968	14,191
Other	1,766	2,416	4,459	4,593
Ending Balance	$ 728,097	$ 736,920	$ 728,097	$ 736,920
Weighted-average credit rate	3.87%	3.88%	3.87%	3.88%
Net amount at risk	$ 1,714,347	$ 1,819,695	$ 1,714,347	$ 1,819,695
Cash surrender value	680,564	675,044	680,564	675,044
Deferred Annuity
Policyholder Account Balance [Roll Forward]
Beginning Balance	739,019	907,797	773,039	954,318
Issuances	160	169	358	371
Premiums received	2,836	3,328	6,409	8,104
Policy charges	0	0	0	0
Surrenders and withdrawals	(30,999)	(43,738)	(62,562)	(87,271)
Benefit payments	(11,366)	(21,628)	(24,137)	(37,412)
Interest credited	5,970	7,185	12,213	14,745
Other	402	(49)	702	209
Ending Balance	$ 706,022	$ 853,064	$ 706,022	$ 853,064
Weighted-average credit rate	3.35%	3.30%	3.35%	3.30%
Cash surrender value	$ 706,022	$ 853,064	$ 706,022	$ 853,064
Other Policy-holders' Funds
Policyholder Account Balance [Roll Forward]
Beginning Balance	401,269	142,686	236,958	123,234
Issuances	0	0	0	0
Premiums received	1,770	46,747	168,470	68,409
Policy charges	0	0	0	0
Surrenders and withdrawals	(3,834)	(3,021)	(7,351)	(6,324)
Benefit payments	0	0	0	0
Interest credited	5,583	2,101	9,104	3,339
Other	(4,163)	(640)	(6,556)	(785)
Ending Balance	$ 400,625	$ 187,873	$ 400,625	$ 187,873
Weighted-average credit rate	5.69%	5.18%	5.69%	5.18%
Cash surrender value	$ 400,625	$ 187,872	$ 400,625	$ 187,872