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Fair Value Measurements Financial Instruments not Carried at Fair Value (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Policy loans $ 82,674,000 $ 83,318,000
Mortgage loans 153,000 157,000
Cash and cash equivalents, at carrying value 19,493,000 34,131,000
Other long-term investments    
Private equity 16,982,000 18,135,000
FHLB common stocks 190,000 190,000
Mortgage loans 153,000 157,000
All other investments 22,000 8,811,000
Other Long-term Investments 17,347,000 27,293,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Annuity - investment contracts 61,716,000 60,861,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Chief Executive Officer [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Due to Officers or Stockholders, Current   8,800,000
Estimate of Fair Value, Fair Value Disclosure [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Policy loans 82,674,000 83,318,000
Mortgage loans 190,000 195,000
Cash and cash equivalents, fair value disclosure 19,493,000 34,131,000
Other long-term investments    
Mortgage loans 190,000 195,000
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Annuity - investment contracts 68,360,000 71,547,000
Policy loans 82,674,000 83,318,000
Cash and cash equivalents, at carrying value 19,493,000 34,131,000
Private equity 16,982,000 11,923,000
Other Long-term Investments 17,347,000 27,294,000
Annuity - investment contracts $ 81,003,000 $ 78,304,000
Insurance policy loans interest rate 7.70% 7.70%
Mortgage loans on real estate, interest rate 6.40% 6.40%
Mortgage loan maturity lower end range 7 years  
Mortgage loan maturity higher end range 19 years  
Mortgage loans interest rate used to estimate fair value 6.25%  
Fair value minimum interest rate of investment contract 0.20% 0.22%
Fair value maximum rate of investment contract 2.86% 2.34%