Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Fixed maturity securities, held-to-maturity, allowance for credit losses	$ 276	$ 195
Fixed maturity securities, fair value	525,637	575,850
Fixed maturity securities, available-for-sale, allowance for credit losses	0	0
Fixed maturity securities, amortized cost	341,297	324,597
Equity securities, cost	49,422	44,175
Amounts recoverable from reinsurers, allowance for credit losses	369	440
Premiums receivable, allowance for credit losses	$ 4,746	$ 4,386
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,676,474	20,622,304
Common stock, shares outstanding	19,296,632	19,364,054
Treasury stock, shares	1,379,842	1,258,250