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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock [Member] | Series C Preferred Stock [Member] Accumulated Earnings [Member] | Series C Preferred Stock [Member] | Series D Preferred Stock [Member] Accumulated Earnings [Member] | Series D Preferred Stock [Member] | Treasury Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 188 |  |  |  |  |  | $ 175,163 | $ 79,660 | $ 845 | $ 255,856
Balance, shares at Dec. 31, 2008 | 18,856,602 |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 47,563 |  | 47,563
Other comprehensive income: |  |  |  |  |  |  |  |  |  |
Change in unrealized gains, net of tax |  |  |  |  |  |  |  |  | 1,131 | 1,131
Change in deferred tax valuation allowance |  |  |  |  |  |  |  |  | 752 | 752
Comprehensive income |  |  |  |  |  |  |  |  |  | 49,446
Common stock issued upon exercise of options | 1 |  |  |  |  |  | 295 |  |  | 296
Common stock issued upon exercise of options, shares | 32,800 |  |  |  |  |  |  |  |  |
Restricted common stock issued |  |  |  |  |  |  | 131 |  |  | 131
Restricted common stock issued, shares | 5,844 |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  | 1,233 |  |  | 1,233
Tax benefit of share-based compensation |  |  |  |  |  |  | 46 |  |  | 46
Redemption of Series preferred stock |  | (175) | (175) | (700) | (700) |  |  |  |  |
Balance at Dec. 31, 2009 | 189 |  |  |  |  |  | 176,868 | 126,348 | 2,728 | 306,133
Balance, shares at Dec. 31, 2009 | 18,895,246 |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 34,606 |  | 34,606
Other comprehensive income: |  |  |  |  |  |  |  |  |  |
Change in unrealized gains, net of tax |  |  |  |  |  |  |  |  | (1,748) | (1,748)
Change in deferred tax valuation allowance |  |  |  |  |  |  |  |  | (715) | (715)
Comprehensive income |  |  |  |  |  |  |  |  |  | 32,143
Common stock issued upon exercise of options | 2 |  |  |  |  |  | 1,453 |  |  | 1,455
Common stock issued upon exercise of options, shares | 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 Common |  |  |  |  |  | (12,102) |  |  |  | (12,102)
Purchase of Treasury Stock Common, shares |  |  |  |  |  | (708,608) |  |  |  |
Balance at Dec. 31, 2010 | 191 |  |  |  |  | (12,102) | 180,884 | 160,954 | 265 | 330,192
Balance, shares at Dec. 31, 2010 | 19,060,649 |  |  |  |  | 708,608 |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | 24,125 |  | 24,125
Other comprehensive income: |  |  |  |  |  |  |  |  |  |
Change in unrealized gains, net of tax |  |  |  |  |  |  |  |  | 1,986 | 1,986
Change in deferred tax valuation allowance |  |  |  |  |  |  |  |  | (36) | (36)
Comprehensive income |  |  |  |  |  |  |  |  |  | 26,075
Common stock issued upon exercise of options | 3 |  |  |  |  |  | 3,336 |  |  | 3,339
Common stock issued upon exercise of options, shares | 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 Common |  |  |  |  |  | (10,268) |  |  |  | (10,268)
Purchase of Treasury Stock Common, shares |  |  |  |  |  | (549,642) |  |  |  |
Balance at Dec. 31, 2011 | $ 194 |  |  |  |  | $ (22,370) | $ 185,734 | $ 185,079 | $ 2,215 | $ 350,852
Balance, shares at Dec. 31, 2011 | 19,408,512 |  |  |  |  | 1,258,250 |  |  |  |

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