Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Debt securities, amortized cost	$ 152,217	$ 150,732
Equity securities, amortized cost	$ 11,652	$ 10,972
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	9,707,817	9,707,817
Common stock, shares outstanding (in shares)	9,707,817	9,707,817