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Fair Value Measurements - Financial Instruments not Carried at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Reported Value Measurement [Member]    
Financial assets:    
Policy loans $ 75,274 $ 75,359
Mortgage loans 39 42
Cash and cash equivalents 23,242 26,997
Financial liabilities:    
Annuity - investment contracts 67,518 67,690
Other Long-Term Investments    
Limited partnership 84,853 82,460
FHLB common stocks 204 202
Mortgage loans 39 42
All other investments 22 21
Other long-term investments 85,118 82,725
Reported Value Measurement [Member] | Single Family    
Financial assets:    
Mortgage loans 39 42
Other Long-Term Investments    
Mortgage loans 39 42
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial assets:    
Policy loans 75,274 75,359
Cash and Cash Equivalents, Fair Value Disclosure 23,242 26,997
Financial liabilities:    
Annuity - investment contracts 61,576 63,283
Estimate of Fair Value, Fair Value Disclosure [Member] | Single Family    
Financial assets:    
Mortgage loans 40 42
Other Long-Term Investments    
Mortgage loans 40 42
Policy loans 75,274 75,359
Cash and cash equivalents $ 23,242 $ 26,997
Insurance policy loans interest rate 7.70% 7.70%
Fair value minimum interest rate of investment contract 4.13% 3.80%
Fair value maximum rate of investment contract 4.63% 4.50%
Limited partnership $ 84,853 $ 82,460
Other long-term investments $ 85,118 $ 82,725
Single Family    
Financial liabilities:    
Mortgage loans on real estate, interest rate 7.00% 7.00%
Mortgage loan maturity higher end range 4 years  
Mortgage loans interest rate used to estimate fair value 6.25% 6.25%