Policyholders' Liabilities - Liability for Future Policy Benefit, Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	$ 1,218,295,000	$ 1,380,100,000	$ 1,198,647,000
Accident and health	848,000		767,000
Total future policy benefit reserves	1,219,143,000	1,380,866,000	1,199,414,000
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	(26,207,000)	(26,931,000)
Interest Expense	10,906,000	10,920,000
Home Service Insurance:
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	338,758,000	324,072,000	336,096,000	$ 322,765,000
Gross Premiums	(11,085,000)	(10,676,000)
Interest Expense	2,910,000	2,901,000
Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	965,896,000	1,076,783,000
Gross Premiums	(26,055,000)	(26,838,000)
Interest Expense	10,906,000	10,920,000
Life Insurance, Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	726,197,000	811,542,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	1,478,777,000	1,468,066,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	607,319,000	623,969,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	965,720,000	1,064,435,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	474,777,000	523,290,000
Gross Premiums	(22,458,000)	(22,257,000)
Interest Expense	$ 8,570,000	$ 8,570,000
Liability for Future Policy Benefit, Weighted-Average Duration	8 years 1 month 6 days	8 years 9 months 18 days
Liability for Future Policy Benefit, Current Weighted-Average Duration	8 years 4 months 24 days	9 years 1 month 6 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate	4.92%	4.93%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	4.86%	3.43%
Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	$ 186,878,000	$ 214,281,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	321,985,000	322,955,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	46,845,000	47,904,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	197,673,000	220,781,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	41,719,000	44,202,000
Gross Premiums	(4,168,000)	(3,656,000)
Interest Expense	$ 2,336,000	$ 2,350,000
Liability for Future Policy Benefit, Weighted-Average Duration	7 years 7 months 6 days	8 years
Liability for Future Policy Benefit, Current Weighted-Average Duration	7 years 7 months 6 days	8 years 4 months 24 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate	4.30%	4.33%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	4.85%	3.38%
Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	$ 26,347,000	$ 23,042,000
Life Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	26,474,000	27,918,000
Gross Premiums	(77,000)	(1,425,000)
Interest Expense	0	0
Life Insurance, Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	(648,000)	(500,000)
Interest Expense	0	0
Home Service Insurance, Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	252,399,000	303,317,000
Gross Premiums	(10,879,000)	(10,483,000)
Interest Expense	2,910,000	2,901,000
Home Service Insurance, Life Insurance, Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	108,972,000	136,987,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	478,978,000	453,855,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	463,491,000	459,627,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	205,841,000	234,340,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	277,098,000	308,271,000
Gross Premiums	(8,372,000)	(8,456,000)
Interest Expense	$ 1,324,000	$ 1,342,000
Liability for Future Policy Benefit, Weighted-Average Duration	15 years 10 months 24 days	16 years
Liability for Future Policy Benefit, Current Weighted-Average Duration	16 years 1 month 6 days	16 years 3 months 18 days
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate	4.99%	5.01%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.09%	3.68%
Home Service Insurance, Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	$ 104,589,000	$ 130,425,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance	319,390,000	304,278,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance	77,743,000	65,371,000
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	119,104,000	141,150,000
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance	54,170,000	53,038,000
Gross Premiums	(2,154,000)	(2,041,000)
Interest Expense	$ 1,586,000	$ 1,559,000
Liability for Future Policy Benefit, Weighted-Average Duration	14 years 6 months	15 years 2 months 12 days
Liability for Future Policy Benefit, Current Weighted-Average Duration	15 years 2 months 12 days	17 years 6 months
Liability for Future Policy Benefit, Original Weighted-Average Discount Rate	5.05%	5.06%
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate	5.08%	3.67%
Home Service Insurance, Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	$ 25,113,000	$ 22,502,000
Home Service Insurance, Life Insurance, Other
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	13,725,000	13,403,000
Gross Premiums	(368,000)	0
Interest Expense	0	0
Home Service Insurance, Life Insurance, Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	(15,000)	(14,000)
Interest Expense	0	0
Life Insurance, Accident And Health, Net Of Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	(152,000)	(93,000)
Interest Expense	0	0
Life Insurance, Accident And Health, Other
Liability for Future Policy Benefit, Activity [Line Items]
Accident and health	599,000	521,000
Gross Premiums	(152,000)	(94,000)
Interest Expense	0	0
Life Insurance, Accident And Health, Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	0	(1,000)
Interest Expense	0	0
Home Service Insurance, Accident And Health, Net Of Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	(206,000)	(193,000)
Interest Expense	0	0
Home Service Insurance, Accident And Health, Other
Liability for Future Policy Benefit, Activity [Line Items]
Accident and health	249,000	245,000
Gross Premiums	(206,000)	(193,000)
Interest Expense	0	0
Home Service Insurance, Accident And Health, Reinsurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	0	0
Interest Expense	0	0
Permanent
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	835,169,000	948,529,000
Permanent | Home Service Insurance:
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	215,942,000	205,998,000	214,188,000	205,340,000
Permanent Limited Pay
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	291,467,000	344,706,000
Permanent Limited Pay | Home Service Insurance:
Liability for Future Policy Benefit, Activity [Line Items]
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance	122,816,000	118,074,000	$ 121,908,000	$ 117,425,000
Deferred Profit Liability
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	51,460,000	45,544,000
Other
Liability for Future Policy Benefit, Activity [Line Items]
Life insurance	40,199,000	41,321,000
Accident And Health, Other
Liability for Future Policy Benefit, Activity [Line Items]
Accident and health	848,000	766,000
Life Insurance And Accident And Health
Liability for Future Policy Benefit, Activity [Line Items]
Total future policy benefit reserves	966,495,000	1,077,304,000
Home Service Insurance, Life Insurance And Home Service Insurance, Accident And Health
Liability for Future Policy Benefit, Activity [Line Items]
Total future policy benefit reserves	$ 252,648,000	$ 303,562,000