Condensed Consolidated Statements Of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues
Gross premiums written	$ 84,924	$ 71,359
Ceded premiums written	(3,904)	(3,582)
Net premiums written	81,020	67,777
Net premiums earned	69,790	60,089
Net investment income	6,914	6,546
Net realized gains on investments	1,791	103
Fee and other income	159	221
Total revenues	78,654	66,959
Expenses
Loss and loss adjustment expenses incurred	51,843	44,176
Underwriting and certain other operating costs	4,287	5,167
Commissions	5,295	4,286
Salaries and benefits	5,133	5,106
Interest expense	279	379
Policyholder dividends	384	355
Total expenses	67,221	59,469
Income before income taxes	11,433	7,490
Income tax expense	1,872	860
Net income	9,561	6,630
Net income available to common shareholders	$ 9,561	$ 6,630
Earnings per share
Basic	$ 0.53	$ 0.36
Diluted	$ 0.52	$ 0.35
Shares used in computing earnings per share
Basic	18,140,749	18,232,600
Diluted	18,542,330	18,709,166