Deposit with Regulatory Authorities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	$ 19,101	$ 19,089
National Western Life Insurance Company:
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	15,782	15,758
National Western Life Insurance Company: | Debt securities available-for-sale
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	15,307	15,283
National Western Life Insurance Company: | Short-term investments
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	475	475
Ozark National Life Insurance Company:
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	3,319	3,331
Ozark National Life Insurance Company: | Debt securities available-for-sale
Schedule of Deposit with Regulatory Authorities [Line Items]
Assets deposited with state and other regulatory authorities	$ 3,319	$ 3,331