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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated (Deficit) Retained Earnings [Member] | Treasury Stock, at Cost [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ 453,387 | $ 257 | $ 554,904 | $ 463 | $ (32,379) | $ (69,858)
Beginning balance issued, shares at Dec. 31, 2014 |  | 32,488,097 |  |  |  |
Beginning balance treasury stock, shares at Dec. 31, 2014 |  | (577,894) |  |  |  |
Beginning balance outstanding, shares at Dec. 31, 2014 |  | 31,910,203 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 616 |  | 616 |  |  |
Stock options exercised, shares | 46,516 | 46,516 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 | $ 0 | 0 | 0 | 0 | 0
Restricted stock awards, net of forfeitures, shares |  | 31,909 |  |  |  |
Share-based compensation expense | 2,241 |  | 2,241 |  |  |
Restricted stock surrendered due to employee tax liability | (349) |  |  |  |  | (349)
Restricted stock surrendered due to employee tax liability, shares |  | (14,269) |  |  |  |
Cash dividends declared | (15,022) |  |  |  | (15,022) |
Net income | 53,823 |  |  |  | 53,823 |
Change in unrealized gain (loss) on securities available for sale and interest-only strips, net of income taxes | (778) |  |  | (778) |  |
Ending balance at Dec. 31, 2015 | 493,918 | $ 257 | 557,761 | (315) | 6,422 | (70,207)
Ending balance issued, shares at Dec. 31, 2015 |  | 32,566,522 |  |  |  |
Ending balance treasury stock, shares at Dec. 31, 2015 |  | (592,163) |  |  |  |
Ending balance outstanding, shares at Dec. 31, 2015 |  | 31,974,359 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Correction of accounting for the 2011 1-for-8 stock split |  | $ (224) | 224 |  |  |
Stock options exercised | $ 1,453 |  | 1,453 |  |  |
Stock options exercised, shares | 94,997 | 94,997 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures, shares |  | 284,678 |  |  |  |
Share-based compensation expense | 3,008 |  | 3,008 |  |  |
Restricted stock surrendered due to employee tax liability | (579) |  |  |  |  | (579)
Restricted stock surrendered due to employee tax liability, shares |  | (23,287) |  |  |  |
Cash dividends declared | (21,185) |  |  |  | (21,185) |
Net income | 56,489 |  |  |  | 56,489 |
Change in unrealized gain (loss) on securities available for sale and interest-only strips, net of income taxes | (2,079) |  |  | (2,079) |  |
Ending balance at Dec. 31, 2016 | $ 531,025 | $ 33 | 562,446 | (2,394) | 41,726 | (70,786)
Ending balance issued, shares at Dec. 31, 2016 |  | 32,946,197 |  |  |  |
Ending balance treasury stock, shares at Dec. 31, 2016 | (615,450) | (615,450) |  |  |  |
Ending balance outstanding, shares at Dec. 31, 2016 |  | 32,330,747 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 288 |  | 288 |  |  |
Stock options exercised, shares | 23,813 | 23,813 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures, shares |  | 113,123 |  |  |  |
Share-based compensation expense | 2,893 |  | 2,893 |  |  |
Restricted stock surrendered due to employee tax liability | (1,103) |  |  |  |  | (1,103)
Restricted stock surrendered due to employee tax liability, shares |  | (36,056) |  |  |  |
Cash dividends declared | (25,811) |  |  |  | (25,811) |
Net income | 54,660 |  |  |  | 54,660 |
Change in unrealized gain (loss) on securities available for sale and interest-only strips, net of income taxes | 525 |  |  | 525 |  |
Ending balance at Dec. 31, 2017 | $ 562,477 | $ 33 | $ 565,627 | $ (1,869) | $ 70,575 | $ (71,889)
Ending balance issued, shares at Dec. 31, 2017 |  | 33,083,133 |  |  |  |
Ending balance treasury stock, shares at Dec. 31, 2017 | (651,506) | (651,506) |  |  |  |
Ending balance outstanding, shares at Dec. 31, 2017 |  | 32,431,627 |  |  |  |

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