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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 (As previously reported) | $ 306,133 | $ 189 |  | $ 176,868 | $ 126,348 | $ 2,728
Beginning Balance (As adjusted) | 304,748 | 189 |  | 176,868 | 124,963 | 2,728
Beginning Balance (Cumulative effect of accounting change - deferred policy acquisition costs) | (1,385) |  |  |  | (1,385) |
Beginning Balance, Shares at Dec. 31, 2009 (As previously reported) |  | 18,895,246 |  |  |  |
Beginning Balance, Shares (As adjusted) |  | 18,895,246 |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 34,520 |  |  |  | 34,520 |
Net income at Jan. 01, 2010 (As previously reported) | 34,606 |  |  |  |  |
Net income (As adjusted) | (86) |  |  |  |  |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains, net of tax | (1,748) |  |  |  |  | (1,748)
Change in deferred tax valuation allowance | (715) |  |  |  |  | (715)
Comprehensive income | 32,057 |  |  |  |  |
Comprehensive income at Jan. 01, 2010 (As previously reported) | 32,143 |  |  |  |  |
Comprehensive income (As adjusted) | 32,057 |  |  |  |  |
Common stock issued upon exercise of options | 1,455 | 2 |  | 1,453 |  |
Common stock issued upon exercise of options, Shares | 153,157 | 153,157 |  |  |  |
Restricted common stock issued | 163 |  |  | 163 |  |
Restricted common stock issued, Shares |  | 12,246 |  |  |  |
Share-based compensation | 2,162 |  |  | 2,162 |  |
Tax benefit of share-based compensation | 238 |  |  | 238 |  |
Purchase of treasury stock | (12,102) |  | (12,102) |  |  |
Purchase of treasury stock, Shares |  |  | (708,608) |  |  |
Ending Balance at Dec. 31, 2010 | 328,721 | 191 | (12,102) | 180,884 | 159,483 | 265
Ending Balance, Shares at Dec. 31, 2010 |  | 19,060,649 | (708,608) |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 24,181 |  |  |  | 24,181 |
Net income at Jan. 01, 2011 (As previously reported) | 24,125 |  |  |  |  |
Net income (As adjusted) | 56 |  |  |  |  |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains, net of tax | 1,986 |  |  |  |  | 1,986
Change in deferred tax valuation allowance | (36) |  |  |  |  | (36)
Comprehensive income | 26,131 |  |  |  |  |
Comprehensive income at Jan. 01, 2011 (As previously reported) | 26,075 |  |  |  |  |
Comprehensive income (As adjusted) | 26,131 |  |  |  |  |
Common stock issued upon exercise of options | 3,339 | 3 |  | 3,336 |  |
Common stock issued upon exercise of options, Shares | 338,350 | 338,350 |  |  |  |
Restricted common stock issued | 210 |  |  | 210 |  |
Restricted common stock issued, Shares |  | 9,513 |  |  |  |
Share-based compensation | 261 |  |  | 261 |  |
Tax benefit of share-based compensation | 1,043 |  |  | 1,043 |  |
Purchase of treasury stock | (10,268) |  | (10,268) |  |  |
Purchase of treasury stock, Shares |  |  | (549,642) |  |  |
Ending Balance at Dec. 31, 2011 (As previously reported) | 350,852 |  |  |  |  |
Ending Balance (As adjusted) | (1,415) |  |  |  |  |
Ending Balance at Dec. 31, 2011 | 349,437 | 194 | (22,370) | 185,734 | 183,664 | 2,215
Ending Balance, Shares at Dec. 31, 2011 |  | 19,408,512 | (1,258,250) |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 29,353 |  |  |  | 29,353 |
Other comprehensive income: |  |  |  |  |  |
Change in unrealized gains, net of tax | 764 |  |  |  |  | 764
Change in deferred tax valuation allowance | 0 |  |  |  |  |
Comprehensive income | 30,117 |  |  |  |  |
Common stock issued upon exercise of options | 781 | 1 |  | 780 |  |
Common stock issued upon exercise of options, Shares | 86,800 | 86,800 |  |  |  |
Restricted common stock issued | 240 |  |  | 240 |  |
Restricted common stock issued, Shares |  | 18,164 |  |  |  |
Share-based compensation | 226 |  |  | 226 |  |
Tax benefit of share-based compensation | 421 |  |  | 421 |  |
Ending Balance at Dec. 31, 2012 | $ 381,222 | $ 195 | $ (22,370) | $ 187,401 | $ 213,017 | $ 2,979
Ending Balance, Shares at Dec. 31, 2012 |  | 19,513,476 | (1,258,250) |  |  |

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