Fair Values of Financial Instruments, Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	$ 257,011	$ 254,106
Equity securities	22,688	18,716
Recurring [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	257,011	254,106
Equity securities	22,688	18,716
Cash equivalents	7,384	12,010
Assets at fair value	287,083	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	250	0
Equity securities	22,531	18,573
Cash equivalents	7,384	12,010
Assets at fair value	30,165	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	256,761	254,106
Equity securities	0	0
Cash equivalents	0	0
Assets at fair value	256,761	254,106
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	0	0
Equity securities	157	143
Cash equivalents	0	0
Assets at fair value	$ 157	$ 143