Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Gross premiums written	$ 97,342	$ 95,078
Ceded premiums written	(2,330)	(2,391)
Net premiums written	95,012	92,687
Net premiums earned	87,310	90,912
Net investment income	7,209	6,710
Net realized losses on investments	(31)	(181)
Net unrealized losses on equity securities	(390)
Fee and other income	77	101
Total revenues	94,175	97,542
Expenses
Loss and loss adjustment expenses incurred	53,162	56,216
Underwriting and certain other operating costs	7,846	8,500
Commissions	6,494	6,410
Salaries and benefits	5,926	6,312
Policyholder dividends	1,333	1,371
Total expenses	74,761	78,809
Income before income taxes	19,414	18,733
Income tax expense	3,245	5,209
Net income	$ 16,169	$ 13,524
Earnings per share
Basic	$ 0.84	$ 0.71
Diluted	$ 0.84	$ 0.70
Shares used in computing earnings per share
Basic	19,187,136	19,150,400
Diluted	19,262,237	19,230,125
Cash dividends declared per common share	$ 0.22	$ 0.20