Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Fixed maturity securities, held-to-maturity, allowance for credit losses	$ 220	$ 239
Fixed maturity securities-held-to-maturity	463,814	468,144
Fixed maturity securities, available-for-sale, allowance for credit losses	0	0
Fixed maturity securities, amortized cost	356,984	338,593
Equity securities, cost	50,115	50,185
Amounts recoverable from reinsurers, allowance for credit losses	328	372
Premiums receivable, allowance for credit losses	$ 4,864	$ 4,852
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,677,086	20,678,572
Common stock, shares outstanding	19,154,387	19,155,873
Treasury stock, shares	1,522,699	1,522,699