Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Net premiums earned	$ 267,125	$ 271,698	$ 275,993
Net investment income	31,339	27,223	25,435
Net realized gains on investments	6,579	3,440	1,695
Net unrealized gains (losses) on equity securities	1,228	(8,092)	12,315
Fee and other income	582	468	496
Total revenues	306,853	294,737	315,934
Expenses
Loss and loss adjustment expenses incurred	148,263	152,316	160,798
Underwriting and certain other operating costs	27,508	24,039	24,813
Commissions	23,446	21,483	21,284
Salaries and benefits	27,359	26,510	25,954
Policyholder dividends	2,957	2,699	3,715
Provision for investment related credit loss expense (benefit)	(57)	44	(79)
Total expenses	229,476	227,091	236,485
Income before income taxes	77,377	67,646	79,449
Income tax expense	15,269	12,044	13,693
Net income	$ 62,108	$ 55,602	$ 65,756
Earnings per share
Basic	$ 3.24	$ 2.89	$ 3.40
Diluted	$ 3.23	$ 2.88	$ 3.39
Shares used in computing earnings per share
Basic	19,149,080	19,233,241	19,332,391
Diluted	19,226,021	19,321,717	19,408,619
Extraordinary cash dividends declared per common share	$ 3.50	$ 4.00	$ 4.00
Cash dividends declared per common share	$ 1.36	$ 1.24	$ 1.16