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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Accumulated (Deficit) Retained Earnings | Treasury Stock, at Cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ 493,918 | $ 257 | $ 557,761 | $ (315) | $ 6,422 | $ (70,207)
Beginning balance issued (shares) at Dec. 31, 2015 |  | 32,566,522,000 |  |  |  |
Beginning balance treasury stock (shares) at Dec. 31, 2015 |  | (592,163,000) |  |  |  |
Beginning balance outstanding (shares) at Dec. 31, 2015 |  | 31,974,359,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | 1,453 |  | 1,453 |  |  |
Stock options exercised (shares) |  | 94,997,000 |  |  |  |
Restricted stock awards, net of forfeitures | 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 284,678,000 |  |  |  |
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 |  | (23,287,000) |  |  |  |
Cash dividends declared | (21,185) |  |  |  | (21,185) |
Net income | 56,489 |  |  |  | 56,489 |
Change in unrealized gain (loss) on securities available for sale, 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 |  | 32,946,197,000 |  |  |  |
Ending balance treasury stock (shares) at Dec. 31, 2016 |  | (615,450,000) |  |  |  |
Ending balance outstanding (shares) at Dec. 31, 2016 |  | 32,330,747,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | 288 |  | 288 |  |  |
Stock options exercised (shares) |  | 23,813,000 |  |  |  |
Restricted stock awards, net of forfeitures | 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 113,123,000 |  |  |  |
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 |  | 36,056,000 |  |  |  |
Cash dividends declared | (25,811) |  |  |  | (25,811) |
Net income | 54,660 |  |  |  | 54,660 |
Change in unrealized gain (loss) on securities available for sale, 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 |  | 33,083,133,000 |  |  |  |
Ending balance treasury stock (shares) at Dec. 31, 2017 | (651,506) | (651,506,000) |  |  |  |
Ending balance outstanding (shares) at Dec. 31, 2017 |  | 32,431,627,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 570 |  | 570 |  |  |
Stock options exercised (shares) |  | 25,750,000 |  |  |  |
Restricted stock awards, net of forfeitures | 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  | 93,486,000 |  |  |  |
Share-based compensation expense | 3,515 |  | 3,515 |  |  |
Restricted stock surrendered due to employee tax liability | (680) |  |  |  |  | (680)
Repurchase of common stock | (36,068) |  |  |  |  | (36,068)
Repurchase of common stock (shares) |  | (1,600,000,000) |  |  |  |
Restricted stock surrendered due to employee tax liability |  | (22,426,000) |  |  |  |
Cash dividends declared | (30,921) |  |  |  | (30,921) |
Net income | 57,868 |  |  |  | 57,868 |
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (4,193) |  |  | (4,193) |  |
Ending balance at Dec. 31, 2018 | $ 552,568 | $ 33 | $ 569,712 | $ (6,079) | $ 97,539 | $ (108,637)
Ending balance issued (shares) at Dec. 31, 2018 |  | 33,202,369,000 |  |  |  |
Ending balance treasury stock (shares) at Dec. 31, 2018 | (2,273,932) | (2,273,932,000) |  |  |  |
Ending balance outstanding (shares) at Dec. 31, 2018 |  | 30,928,437,000 |  |  |  |

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