Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed maturity securities, held-to-maturity, allowance for credit losses	$ 182,000	$ 239,000
Fixed maturity securities, fair value	473,092,000	468,144,000
Fixed maturity securities, available-for-sale, allowance for credit losses	0	0
Fixed maturity securities, amortized cost	326,171,000	338,593,000
Equity securities, cost	44,046,000	50,185,000
Amounts recoverable from reinsurers, allowance for credit losses	360,000	372,000
Premiums receivable, allowance for credit losses	$ 4,674,000	$ 4,852,000	$ 4,386,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	20,704,448	20,678,572
Common stock, shares outstanding	19,135,008	19,155,873
Treasury stock, shares	1,569,440	1,522,699