Policyholders' Liabilities - Reconciliation to Liability for Future policy Benefits (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	$ 1,195,430	$ 1,229,253	$ 1,218,295
Liability for Future Policy Benefits, Disability and Accident Benefits	844	889	848
Total future policy benefit reserves	1,196,274	$ 1,230,142	1,219,143
Life Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	709,598		726,197
Home Service Insurance, Life Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	107,648		108,972
Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	817,246		835,169
Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	176,347		186,878
Home Service Insurance, Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	102,403		104,589
Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	278,750		291,467
Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	29,258		26,347
Home Service Insurance, Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	27,432		25,113
Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	56,690		51,460
Life Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	28,818		26,474
Home Service Insurance, Life Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	13,926		13,725
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	42,744		40,199
Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	944,021		965,896
Home Service Insurance, Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	251,409		252,399
Life Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefits, Disability and Accident Benefits	514		599
Home Service Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefits, Disability and Accident Benefits	330		249
Life Insurance And Accident And Health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Total future policy benefit reserves	944,535		966,495
Home Service Insurance, Life Insurance And Home Service Insurance, Accident And Health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Total future policy benefit reserves	$ 251,739		$ 252,648