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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock - Number of Shares, Shares Issued [Member] | Common Stock - Number of Shares, Treasury Shares [Member] | Stockholders' Equity Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2016 | $ 531,025 | $ 33 | $ (70,786) | $ 562,446 | $ (2,394) | $ 41,726
Beginning balance, shares issued (shares) at Dec. 31, 2016 |  | 32,946,197 |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2016 |  |  | (615,450) |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2016 | 32,330,747 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 270 |  |  | 270 |  |
Stock options exercised (shares) | 22,125 | 22,125 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) | 90,844 | 90,844 |  |  |  |
Share-based compensation expense | $ 2,071 |  |  | 2,071 |  |
Restricted stock surrendered due to employee tax liability (shares) | (30,634) |  | (30,634) |  |  |
Restricted stock surrendered due to employee tax liability | $ (935) |  | $ (935) |  |  |
Cash dividends declared | (19,030) |  |  |  |  | (19,030)
Net income | 43,162 |  |  |  |  | 43,162
Change in unrealized gain (loss) on securities available for sale, net of income taxes | 2,684 |  |  |  | 2,684 |
Balance at end of period at Sep. 30, 2017 | $ 559,247 | $ 33 | $ (71,721) | 564,787 | 290 | 65,858
Ending balance, shares issued (shares) at Sep. 30, 2017 |  | 33,059,166 |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2017 |  |  | (646,084) |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2017 | 32,413,082 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adjustments related to adoption of new accounting standards: | ASU 2016-01 [Member] | $ 0 |  |  |  | 382 | (382)
Adjustments related to adoption of new accounting standards: | ASU 2018-02 [Member] | 0 |  |  |  | (399) | 399
Adjusted balance at January 1, 2018 | 562,477 | $ 33 | $ (71,889) | 565,627 | (1,886) | 70,592
Balance at beginning of period at Dec. 31, 2017 | $ 562,477 | $ 33 | $ (71,889) | 565,627 | (1,869) | 70,575
Beginning balance, shares issued (shares) at Dec. 31, 2017 |  | 33,083,133 |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2017 | (651,506) |  | (651,506) |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2017 | 32,431,627 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised | $ 570 |  |  | 570 |  |
Stock options exercised (shares) | 25,750 | 25,750 |  |  |  |
Restricted stock awards, net of forfeitures | $ 0 |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) | 79,950 | 79,950 |  |  |  |
Share-based compensation expense | $ 2,664 |  |  | 2,664 |  |
Restricted stock surrendered due to employee tax liability (shares) | (20,533) |  | (20,533) |  |  |
Restricted stock surrendered due to employee tax liability | $ (607) |  | $ (607) |  |  |
Repurchase of common stock (shares) | (429,558) |  | (429,558) |  |  |
Repurchase of common stock | $ (11,123) |  | $ (11,123) |  |  |
Cash dividends declared | (23,308) |  |  |  |  | (23,308)
Net income | 46,484 |  |  |  |  | 46,484
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (9,409) |  |  |  | (9,409) |
Balance at end of period at Sep. 30, 2018 | $ 567,748 | $ 33 | $ (83,619) | 568,861 | (11,295) | 93,768
Ending balance, shares issued (shares) at Sep. 30, 2018 |  | 33,188,833 |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2018 | (1,101,597) |  | (1,101,597) |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2018 | 32,087,236 |  |  |  |  |
Balance at beginning of period at Jun. 30, 2018 |  |  |  |  | (9,324) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock options exercised (shares) | 0 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | $ 567,748 | $ 33 | $ (83,619) | $ 568,861 | $ (11,295) | $ 93,768
Ending balance, shares issued (shares) at Sep. 30, 2018 |  | 33,188,833 |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2018 | (1,101,597) |  | (1,101,597) |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2018 | 32,087,236 |  |  |  |  |

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