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Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues      
Premiums earned $ 290,689 $ 251,015 $ 218,881
Net investment income 27,018 26,340 26,242
Net realized gains on investments 2,979 2,228 2,449
Fee and other income 562 1,080 584
Total revenues 321,248 280,663 248,156
Expenses      
Loss and loss adjustment expenses incurred 219,903 189,706 157,388
Underwriting and certain other operating costs 18,450 22,404 6,409
Commissions 22,144 18,507 16,350
Salaries and benefits 20,839 19,914 21,405
Interest expense 566 1,311 1,548
Policyholder dividends 2,203 1,464 834
Total expenses 284,105 253,306 203,934
Income before income taxes 37,143 27,357 44,222
Income tax expense 7,790 3,176 9,702
Net income $ 29,353 $ 24,181 $ 34,520
Earnings per share      
Basic $ 1.62 $ 1.32 $ 1.85
Diluted $ 1.58 $ 1.29 $ 1.81
Shares used in computing earnings per share      
Basic 18,166,175 18,250,173 18,637,167
Diluted 18,575,133 18,700,982 19,095,320