Fair Values of Financial Instruments, Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	$ 246,801	$ 254,106
Equity securities	17,900	18,716
Recurring [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	246,801	254,106
Equity securities	17,900	18,716
Cash equivalents	9,011	12,010
Assets at fair value	273,712	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	17,817	18,573
Cash equivalents	9,011	12,010
Assets at fair value	26,828	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	246,551	254,106
Equity securities	0	0
Cash equivalents	0	0
Assets at fair value	246,551	254,106
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial instruments carried at fair value measured on a recurring basis [Abstract]
Fixed maturities	250	0
Equity securities	83	143
Cash equivalents	0	0
Assets at fair value	$ 333	$ 143