Commitments and Contingencies (Details)					12 Months Ended
	May 10, 2022 USD ($)	Mar. 04, 2022 USD ($)	Nov. 11, 2019 USD ($)	Jul. 27, 2019 USD ($)	Dec. 31, 2020 class_action_suit	Jun. 30, 2022 USD ($)	Apr. 30, 2019 USD ($)
Revolving Credit Facility
Loss Contingencies [Line Items]
Other commitment						$ 0
New Loans
Loss Contingencies [Line Items]
Other commitment						0
Existing Loans
Loss Contingencies [Line Items]
Other commitment						11,300,000
Capital Contributions to Investment Funds
Loss Contingencies [Line Items]
Other commitment						$ 355,000,000
Williams v Pantaleonietal
Loss Contingencies [Line Items]
Equity indexed annuity							$ 100,000
Punitive damages reversed	$ 2,500,000	$ 2,500,000
Williams v Pantaleonietal | Economic Damages
Loss Contingencies [Line Items]
Loss contingency, compensatory damages awarded	14,949	14,949
Williams v Pantaleonietal | Non-Economic Damages
Loss Contingencies [Line Items]
Loss contingency, punitive damages awarded	420,000	420,000
Williams v Pantaleonietal | Plaintiff Attorney's Fees
Loss Contingencies [Line Items]
Loss contingency, damages awarded	$ 1,260,000	$ 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 proposed claims | class_action_suit					2
Judicial Ruling | Williams v Pantaleonietal | Economic Damages
Loss Contingencies [Line Items]
Loss contingency, compensatory damages awarded				$ 14,949
Judicial Ruling | Williams v Pantaleonietal | Non-Economic Damages
Loss Contingencies [Line Items]
Loss contingency, punitive damages awarded				$ 2,900,000
Judicial Ruling | Williams v Pantaleonietal | Plaintiff Attorney's Fees
Loss Contingencies [Line Items]
Loss contingency, damages awarded			$ 1,260,000