Policyholders' Liabilities - Reconciliation to Liability for Future policy Benefits (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	$ 1,147,601	$ 1,198,647	$ 1,190,502
Accident and health	877	767	729
Total future policy benefit reserves, Life and Disability and Accident Benefits	1,148,478	$ 1,199,414	1,191,231
Life Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	682,693		703,765
Home Service Insurance, Life Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	100,332		107,375
Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	783,025		811,140
Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	172,086		185,486
Home Service Insurance, Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	96,799		104,165
Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	268,885		289,651
Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	27,616		23,749
Home Service Insurance, Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	26,138		23,727
Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	53,754		47,476
Life Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	28,011		28,558
Home Service Insurance, Life Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	13,926		13,677
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	41,937		42,235
Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	910,406		941,558
Home Service Insurance, Life Insurance, Net of Reinsurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Life insurance	237,195		248,944
Life Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Accident and health	596		498
Home Service Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Accident and health	281		231
Life Insurance And Accident And Health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Total future policy benefit reserves, Life and Disability and Accident Benefits	911,002		942,056
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, Life and Disability and Accident Benefits	$ 237,476		$ 249,175