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Fair Values of Financial Instruments, Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financial instruments carried at fair value measured on a recurring basis [Abstract]    
Fixed maturities $ 257,808 $ 254,106
Equity securities 21,903 18,716
Recurring [Member]    
Financial instruments carried at fair value measured on a recurring basis [Abstract]    
Fixed maturities 257,808 254,106
Equity securities 21,903 18,716
Cash equivalents 7,121 12,010
Assets at fair value 286,832 284,832
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial instruments carried at fair value measured on a recurring basis [Abstract]    
Fixed maturities 0 0
Equity securities 21,820 18,573
Cash equivalents 7,121 12,010
Assets at fair value 28,941 30,583
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial instruments carried at fair value measured on a recurring basis [Abstract]    
Fixed maturities 257,684 254,106
Equity securities 0 0
Cash equivalents 0 0
Assets at fair value 257,684 254,106
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial instruments carried at fair value measured on a recurring basis [Abstract]    
Fixed maturities 124 0
Equity securities 83 143
Cash equivalents 0 0
Assets at fair value $ 207 $ 143