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Fair Value Measurements - Financial Instruments not Carried at Fair Value (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Reported Value Measurement [Member]    
Financial Assets:    
Policy loans $ 75,750,000 $ 78,773,000
Mortgage loans 43,000 49,000
Cash and cash equivalents 16,785,000 22,973,000
Financial Liabilities:    
Annuity - investment contracts 67,224,000 67,344,000
Other Long-Term Investments    
Limited partnership 79,535,000 69,294,000
FHLB common stocks 199,000 193,000
Mortgage loans 43,000 49,000
All other investments 21,000 22,000
Other long-term investments 79,798,000 69,558,000
Reported Value Measurement [Member] | Single Family    
Financial Assets:    
Mortgage loans 43,000 49,000
Other Long-Term Investments    
Mortgage loans 43,000 49,000
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial Assets:    
Policy loans 75,750,000 78,773,000
Cash and Cash Equivalents, Fair Value Disclosure 16,785,000 22,973,000
Financial Liabilities:    
Annuity - investment contracts 59,063,000 61,701,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Single Family    
Financial Assets:    
Mortgage loans 44,000 50,000
Other Long-Term Investments    
Mortgage loans 44,000 50,000
Policy loans 75,750,000 78,773,000
Cash and cash equivalents $ 16,785,000 $ 22,973,000
Insurance policy loans interest rate 7.70% 7.70%
Fair value minimum interest rate of investment contract 4.57% 4.74%
Fair value maximum rate of investment contract 5.01% 5.09%
Limited partnership $ 79,535,000 $ 66,846,000
Other long-term investments 79,798,000 69,558,000
Limited Partnership Funds [Member]    
Other Long-Term Investments    
Other invested assets, carried at amortized cost basis $ 0 $ 2,400,000
Single Family    
Financial Liabilities:    
Mortgage loans on real estate, interest rate 7.00% 7.00%
Mortgage loan maturity higher end range 5 years  
Mortgage loans interest rate used to estimate fair value 6.25%