Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturity securities, held-to-maturity, allowance for credit losses	$ 239,000	$ 195,000
Fixed maturity securities, fair value	468,144,000	575,850,000
Fixed maturity securities, available-for-sale, allowance for credit losses	0	0
Fixed maturity securities, amortized cost	338,593,000	324,597,000
Equity securities, cost	50,185,000	44,175,000
Amounts recoverable from reinsurers, allowance for credit losses	372,000	440,000
Premiums receivable, allowance for credit losses	$ 4,852,000	$ 4,386,000	$ 4,791,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,678,572	20,622,304
Common stock, shares outstanding	19,155,873	19,364,054
Treasury stock, shares	1,522,699	1,258,250