Policyholders' Liabilities - Schedule of Liability for Future Policy Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Life Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	$ 258,177	$ 245,437
Beginning balance at original discount rate	265,959	258,283
Effects of actual variances from expected experience			$ (1,568)	$ 2,107
Adjusted beginning of year balance			264,391	260,390
Issuances	18,812	6,995
Interest accrual	2,667	2,344
Net premiums collected	(11,180)	(10,466)
Derecognition and other	(2,409)	191
Ending balance at original discount rate	272,281	259,454
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(9,610)	(9,136)
Balance, end of period	262,671	250,318
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	1,168,472	1,143,027
Beginning balance at original discount rate	1,198,717	1,204,220
Effects of actual variances from expected experience			(498)	3,583
Adjusted beginning of year balance			1,198,219	1,207,803
Issuances	19,073	7,160
Interest accrual	13,080	12,954
Benefit payments	(24,753)	(24,026)
Derecognition and other	(2,974)	26
Ending balance at original discount rate	1,202,645	1,203,917
Effect of changes in discount rates	(54,029)	(40,524)
Post-adoption liability, ending balance	1,148,616	1,163,393
Net liability for future policy benefits	885,945	913,075
Home Service Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	113,757	106,763
Beginning balance at original discount rate	117,557	114,619
Effects of actual variances from expected experience			(2,781)	(2,180)
Adjusted beginning of year balance			114,776	112,439
Issuances	4,837	5,965
Interest accrual	1,189	1,100
Net premiums collected	(2,936)	(2,500)
Derecognition and other	81	178
Ending balance at original discount rate	117,947	117,182
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(6,233)	(5,798)
Balance, end of period	111,714	111,384
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	334,730	316,707
Beginning balance at original discount rate	341,465	336,096
Effects of actual variances from expected experience			(2,445)	(1,274)
Adjusted beginning of year balance			339,020	334,822
Issuances	4,836	5,965
Interest accrual	3,838	3,720
Benefit payments	(5,108)	(5,926)
Derecognition and other	80	177
Ending balance at original discount rate	342,666	338,758
Effect of changes in discount rates	(20,901)	(13,813)
Post-adoption liability, ending balance	321,765	324,945
Net liability for future policy benefits	210,051	213,561
Permanent | Life Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	244,917	235,228
Beginning balance at original discount rate	252,426	247,601
Effects of actual variances from expected experience			(1,772)	1,742
Adjusted beginning of year balance			250,654	249,343
Issuances	18,208	6,236
Interest accrual	2,550	2,272
Net premiums collected	(10,497)	(9,715)
Derecognition and other	(2,456)	153
Ending balance at original discount rate	258,459	248,289
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(9,285)	(8,766)
Balance, end of period	249,174	239,523
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	973,350	947,415
Beginning balance at original discount rate	995,962	996,169
Effects of actual variances from expected experience			(1,592)	2,538
Adjusted beginning of year balance			994,370	998,707
Issuances	18,424	6,375
Interest accrual	11,014	10,842
Benefit payments	(20,342)	(19,153)
Derecognition and other	(2,976)	14
Ending balance at original discount rate	1,000,490	996,785
Effect of changes in discount rates	(41,718)	(31,065)
Post-adoption liability, ending balance	958,772	965,720
Net liability for future policy benefits	709,598	726,197
Permanent | Home Service Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	98,831	93,508
Beginning balance at original discount rate	102,045	100,225
Effects of actual variances from expected experience			(1,703)	(1,371)
Adjusted beginning of year balance			100,342	98,854
Issuances	4,152	4,789
Interest accrual	1,057	986
Net premiums collected	(3,016)	(2,967)
Derecognition and other	74	132
Ending balance at original discount rate	102,609	101,794
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(5,401)	(4,925)
Balance, end of period	97,208	96,869
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	211,946	200,351
Beginning balance at original discount rate	217,524	214,188
Effects of actual variances from expected experience			(1,697)	(1,299)
Adjusted beginning of year balance			215,827	212,889
Issuances	4,153	4,789
Interest accrual	2,401	2,310
Benefit payments	(3,672)	(4,178)
Derecognition and other	73	132
Ending balance at original discount rate	218,782	215,942
Effect of changes in discount rates	(13,926)	(10,101)
Post-adoption liability, ending balance	204,856	205,841
Net liability for future policy benefits	107,648	108,972
Permanent Limited Pay | Life Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	13,260	10,209
Beginning balance at original discount rate	13,533	10,682
Effects of actual variances from expected experience			204	365
Adjusted beginning of year balance			13,737	11,047
Issuances	604	759
Interest accrual	117	72
Net premiums collected	(683)	(751)
Derecognition and other	47	38
Ending balance at original discount rate	13,822	11,165
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(325)	(370)
Balance, end of period	13,497	10,795
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	195,122	195,612
Beginning balance at original discount rate	202,755	208,051
Effects of actual variances from expected experience			1,094	1,045
Adjusted beginning of year balance			203,849	209,096
Issuances	649	785
Interest accrual	2,066	2,112
Benefit payments	(4,411)	(4,873)
Derecognition and other	2	12
Ending balance at original discount rate	202,155	207,132
Effect of changes in discount rates	(12,311)	(9,459)
Post-adoption liability, ending balance	189,844	197,673
Net liability for future policy benefits	176,347	186,878
Permanent Limited Pay | Home Service Insurance:
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]
Balance, beginning of year	14,926	13,255
Beginning balance at original discount rate	15,512	14,394
Effects of actual variances from expected experience			(1,078)	(809)
Adjusted beginning of year balance			14,434	13,585
Issuances	685	1,176
Interest accrual	132	114
Net premiums collected	80	467
Derecognition and other	7	46
Ending balance at original discount rate	15,338	15,388
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax	(832)	(873)
Balance, end of period	14,506	14,515
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Pre-adoption liability, beginning balance	122,784	116,356
Beginning balance at original discount rate	123,941	121,908
Effects of actual variances from expected experience			(748)	25
Adjusted beginning of year balance			$ 123,193	$ 121,933
Issuances	683	1,176
Interest accrual	1,437	1,410
Benefit payments	(1,436)	(1,748)
Derecognition and other	7	45
Ending balance at original discount rate	123,884	122,816
Effect of changes in discount rates	(6,975)	(3,712)
Post-adoption liability, ending balance	116,909	119,104
Net liability for future policy benefits	$ 102,403	$ 104,589