Commitments and Contingencies (Details)							12 Months Ended
	Mar. 04, 2022 USD ($)	Oct. 15, 2021 USD ($)	Feb. 16, 2021 class_action_suit	Nov. 11, 2019 USD ($)	Jul. 27, 2019 USD ($)	Nov. 11, 2018 USD ($)	Dec. 31, 2021 USD ($) agreement	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2021 USD ($)	Apr. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Rental expense							$ 400,000	$ 500,000	$ 400,000
Number of agreement | agreement							2
Finance lease							$ 1,336,000				$ 1,400,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2022							343,000
2023							343,000
2024							316,000
2025							179,000
2026							165,000
Total minimum lease payments							1,346,000
Less: Interest							$ (10,000)
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]							Other liabilities				Other liabilities
Present value of net minimum lease payments							$ 1,336,000				$ 1,400,000
Guaranty Association Assessments
Loss Contingencies [Line Items]
Guaranty association assessments							100,000	200,000	200,000
IRS payment to be remitted							100,000	$ 200,000	$ 200,000
Tax Status Of Company's International Life Insurance Products | IRS
Loss Contingencies [Line Items]
Guaranty association assessments										$ 4,900,000
IRS payment to be remitted										$ 4,900,000
Payment remittance period after agreement effective date										60 days
Period within which to make the stipulated adjustments after agreement effective date										90 days
New Loans
Loss Contingencies [Line Items]
Commitments to extend credit relating to mortgage loans							5,400,000
Existing Loans
Loss Contingencies [Line Items]
Commitments to extend credit relating to mortgage loans							13,100,000
Capital Contributions To Investment Funds
Loss Contingencies [Line Items]
Commitments to extend credit relating to mortgage loans							256,400,000
Williams v Pantaleoni et al
Loss Contingencies [Line Items]
Equity indexed annuity issued												$ 100,000
Williams v Pantaleoni et al | Subsequent Event
Loss Contingencies [Line Items]
Punitive damages reversed	$ 2,500,000
Williams v Pantaleoni et al | Economic damages
Loss Contingencies [Line Items]
Loss contingency, economic damages awarded					$ 14,949
Williams v Pantaleoni et al | Economic damages | Subsequent Event
Loss Contingencies [Line Items]
Loss contingency, economic damages awarded	14,949
Williams v Pantaleoni et al | Non-economic damages
Loss Contingencies [Line Items]
Loss contingency, non-economic damages awarded					$ 2,900,000
Williams v Pantaleoni et al | Non-economic damages | Subsequent Event
Loss Contingencies [Line Items]
Loss contingency, non-economic damages awarded	420,000
Williams v Pantaleoni et al | Plaintiff attorney's fees
Loss Contingencies [Line Items]
Damages award to plaintiff				$ 1,260,000
Williams v Pantaleoni et al | Plaintiff attorney's fees | Subsequent Event
Loss Contingencies [Line Items]
Damages award to plaintiff	$ 1,260,000
Mildred Baldwin, on behalf of herself and others similarly situated vs. National Western Life Insurance Company
Loss Contingencies [Line Items]
Number of class action suit | class_action_suit			2
Guaranty association assessments							4,400,000
IRS payment to be remitted							$ 4,400,000
Settled Litigation | National Western Life Insurance Company and National Western Life Group, Inc. v. Ross Rankin Moody et. al
Loss Contingencies [Line Items]
Damages award to plaintiff						$ 1,314,054
Judicial Ruling | National Western Life Insurance Company and National Western Life Group, Inc. v. Ross Rankin Moody et. al
Loss Contingencies [Line Items]
Damages award to plaintiff		$ 1,803,503