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Quarterly Financial Data (Unaudited) - Unaudited Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Premiums earned | $ 86,695 | $ 81,596 | $ 81,983 | $ 79,709 | $ 78,741 | $ 72,425 | $ 69,733 | $ 69,790 | $ 329,983 | $ 290,689 | $ 251,015
Net investment income | 6,763 | 6,947 | 6,649 | 6,670 | 6,698 | 6,801 | 6,605 | 6,914 | 27,029 | 27,018 | 26,340
Net realized gains (losses) on investments | 710 | (654) | (1,291) | 24 | 66 | 985 | 137 | 1,791 | (1,211) | 2,979 | 2,228
Total revenues | 94,309 | 88,003 | 87,511 | 86,512 | 85,583 | 80,374 | 76,637 | 78,654 | 356,335 | 321,248 | 280,663
Income before income taxes | 25,030 | 12,447 | 10,647 | 11,080 | 12,674 | 9,003 | 4,033 | 11,433 | 59,204 | 37,143 | 27,357
Net income | 17,443 | 9,699 | 7,644 | 8,851 | 9,226 | 7,121 | 3,445 | 9,561 | 43,637 | 29,353 | 24,181
Net income available to common shareholders | 17,364 | 9,673 | 7,618 | 8,836 | 9,216 | 7,116 | 3,443 | 9,556 | 43,495 | 29,331 | 24,167
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.94 | $ 0.53 | $ 0.42 | $ 0.48 | $ 0.51 | $ 0.39 | $ 0.19 | $ 0.53 | $ 2.37 | $ 1.62 | $ 1.32
Diluted | $ 0.92 | $ 0.52 | $ 0.41 | $ 0.47 | $ 0.50 | $ 0.38 | $ 0.19 | $ 0.52 | $ 2.32 | $ 1.58 | $ 1.29
Comprehensive income | $ 15,819 | $ 8,654 | $ 3,584 | $ 8,306 | $ 8,091 | $ 8,570 | $ 3,948 | $ 9,508 | $ 36,363 | $ 30,117 | $ 26,131
Cash dividends declared per common share | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 |  |  |  |  | $ 0.32 |  |

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