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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Abstract]                      
Premiums earned $ 78,741 $ 72,425 $ 69,733 $ 69,790 $ 66,211 $ 64,454 $ 60,261 $ 60,089 $ 290,689 $ 251,015 $ 218,881
Net investment income 6,698 6,801 6,605 6,914 6,702 6,495 6,597 6,546 27,018 26,340 26,242
Net realized gains on investments 66 985 137 1,791 1,468 512 145 103 2,979 2,228 2,449
Total revenues 85,583 80,374 76,637 78,654 74,910 71,743 67,051 66,959 321,248 280,663 248,156
Income before income taxes 12,674 9,003 4,033 11,433 9,517 5,518 4,832 7,490 37,143 27,357 44,222
Net income 9,226 7,121 3,445 9,561 8,073 4,884 4,594 6,630 29,353 24,181 34,520
Earnings per share:                      
Basic $ 0.51 $ 0.39 $ 0.19 $ 0.53 $ 0.45 $ 0.27 $ 0.25 $ 0.36 $ 1.62 $ 1.32 $ 1.85
Diluted $ 0.50 $ 0.38 $ 0.19 $ 0.52 $ 0.44 $ 0.26 $ 0.24 $ 0.35 $ 1.58 $ 1.29 $ 1.81
Comprehensive income $ 8,091 $ 8,570 $ 3,948 $ 9,508 $ 8,046 $ 6,162 $ 5,386 $ 6,537 $ 30,117 $ 26,131 $ 32,057