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Quarterly Financial Data (Unaudited) - Unaudited Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Premiums earned $ 95,034 $ 90,504 $ 95,569 $ 94,787 $ 97,070 $ 95,928 $ 93,516 $ 89,233 $ 375,894 $ 375,747 $ 329,983
Net investment income 7,256 6,923 6,890 6,833 7,166 6,495 6,845 6,708 27,902 27,214 27,029
Net realized gains (losses) on investments 24 40 (2,617) 59 516 (152) 232 101 (2,494) 697 (1,211)
Total revenues 101,760 97,470 99,936 101,788 104,886 102,336 100,624 96,173 400,954 404,019 356,335
Income before income taxes 33,768 25,890 20,112 21,197 23,936 19,348 17,061 13,404 100,967 73,749 59,204
Net income 23,073 17,940 14,319 15,130 16,865 13,479 12,773 10,549 70,462 53,666 43,637
Net income available to common shareholders $ 23,073 $ 17,940 $ 14,319 $ 15,130 $ 16,865 $ 13,479 $ 12,773 $ 10,549 $ 70,462 $ 53,666 $ 43,495
Earnings per share:                      
Basic $ 1.21 $ 0.95 $ 0.76 $ 0.80 $ 0.90 $ 0.72 $ 0.69 $ 0.57 $ 3.72 $ 2.88 $ 2.37
Diluted $ 1.21 $ 0.94 $ 0.75 $ 0.79 $ 0.89 $ 0.71 $ 0.68 $ 0.56 $ 3.69 $ 2.84 $ 2.32
Comprehensive income $ 22,299 $ 19,248 $ 12,744 $ 15,948 $ 17,597 $ 13,596 $ 15,789 $ 13,789 $ 70,239 $ 60,771 $ 36,363
Extraordinary cash dividends declared per common share $ 3.00       $ 1.00     $ 0.50 $ 3.00 $ 1.50 $ 0.00
Cash dividends declared per common share $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.60 $ 0.48 $ 0.32