Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net premiums written	$ 78,308	$ 75,232
Gross premiums written	82,487	77,791
Ceded premiums written	(4,179)	(2,559)
Revenues
Net premiums earned	69,181	67,556
Net investment income	7,433	6,113
Net realized gains on investments	258	738
Net unrealized gains on equity securities	1,369	1,040
Fee and other income	197	113
Total revenues	78,438	75,560
Expenses
Loss and loss adjustment expenses incurred	39,009	37,741
Underwriting and certain other operating costs	5,156	3,990
Commissions	5,803	5,208
Salaries and benefits	6,023	5,915
Policyholder dividends	931	1,189
Provision for investment related credit loss expense (benefit)	(19)	95
Total expenses	56,903	54,138
Income before income taxes	21,535	21,422
Income tax expense	4,196	4,091
Net income	$ 17,339	$ 17,331
Earnings per share
Basic	$ 0.91	$ 0.90
Diluted	$ 0.90	$ 0.89
Shares used in computing earnings per share
Basic	19,131,356	19,332,006
Diluted	19,235,411	19,430,824
Cash dividends declared per common share	$ 0.34	$ 0.31