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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock - Number of Shares, Shares Issued | Common Stock - Number of Shares, Shares Issued Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock - Number of Shares, Treasury Shares | Common Stock - Number of Shares, Treasury Shares Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 563,267 |  |  | $ 33 |  | $ (116,515) |  | $ 575,816 |  | $ 3,382 |  | $ 100,552 |  |
Balance at beginning of period (ASU 2016-13) at Dec. 31, 2019 |  | $ (12,167) |  |  |  |  |  |  |  |  |  |  | $ (12,167) |
Beginning balance, shares issued (shares) at Dec. 31, 2019 |  |  |  | 33,475,402 | 33,475,402 |  |  |  |  |  |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2019 |  |  |  |  |  | (2,675,778) | (2,675,778) |  |  |  |  |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2019 |  |  |  | 30,799,624 | 30,799,624 |  |  |  |  |  |  |  |  |
Adjusted balance at Dec. 31, 2019 |  |  | $ 551,100 |  | $ 33 |  | $ (116,515) |  | $ 575,816 |  | $ 3,382 |  |  | $ 88,385
Restricted stock awards, net of forfeitures (shares) |  |  |  | 85,581 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 1,911 |  |  |  |  |  |  | 1,911 |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability | (317) |  |  |  |  | $ (317) |  |  |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  |  |  | (30,214) |  | (30,214) |  |  |  |  |  |  |  |
Repurchase of common stock | (2,196) |  |  |  |  | $ (2,196) |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  |  |  | (135,400) |  | (135,400) |  |  |  |  |  |  |  |
Cash dividends declared (common stock, $0.08/share, $0.12/share, $0.44/share, $0.34/share) | (13,504) |  |  |  |  |  |  |  |  |  |  | (13,504) |  |
Net income | 27,870 |  |  |  |  |  |  |  |  |  |  | 27,870 |  |
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (1,661) |  |  |  |  |  |  |  |  | (1,661) |  |  |  |
Balance at end of period at Sep. 30, 2020 | 563,203 |  |  | $ 33 |  | $ (119,029) |  | 577,727 |  | 1,721 |  | 102,751 |  |
Ending balance, shares issued (shares) at Sep. 30, 2020 |  |  |  | 33,560,983 |  |  |  |  |  |  |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2020 |  |  |  |  |  | (2,841,392) |  |  |  |  |  |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2020 |  |  |  | 30,719,591 |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2020 | 547,436 |  |  | $ 33 |  | $ (119,002) |  | 577,211 |  | 335 |  | 88,859 |  |
Beginning balance, shares issued (shares) at Jun. 30, 2020 |  |  |  | 33,495,913 |  |  |  |  |  |  |  |  |  |
Beginning balance, treasury stock (shares) at Jun. 30, 2020 |  |  |  |  |  | (2,838,284) |  |  |  |  |  |  |  |
Beginning balance, shares outstanding (shares) at Jun. 30, 2020 |  |  |  | 30,657,629 |  |  |  |  |  |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  |  |  | 65,070 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 516 |  |  |  |  |  |  | 516 |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability | (27) |  |  |  |  | $ (27) |  |  |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  |  |  | (3,108) |  | (3,108) |  |  |  |  |  |  |  |
Cash dividends declared (common stock, $0.08/share, $0.12/share, $0.44/share, $0.34/share) | (2,452) |  |  |  |  |  |  |  |  |  |  | (2,452) |  |
Net income | 16,344 |  |  |  |  |  |  |  |  |  |  | 16,344 |  |
Change in unrealized gain (loss) on securities available for sale, net of income taxes | 1,386 |  |  |  |  |  |  |  |  | 1,386 |  |  |  |
Balance at end of period at Sep. 30, 2020 | 563,203 |  |  | $ 33 |  | $ (119,029) |  | 577,727 |  | 1,721 |  | 102,751 |  |
Ending balance, shares issued (shares) at Sep. 30, 2020 |  |  |  | 33,560,983 |  |  |  |  |  |  |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2020 |  |  |  |  |  | (2,841,392) |  |  |  |  |  |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2020 |  |  |  | 30,719,591 |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | $ 577,044 |  |  | $ 33 |  | $ (119,046) |  | 578,360 |  | 3,076 |  | 114,621 |  |
Beginning balance, shares issued (shares) at Dec. 31, 2020 |  |  |  | 33,560,801 |  |  |  |  |  |  |  |  |  |
Beginning balance, treasury stock (shares) at Dec. 31, 2020 | (2,842,966) |  |  |  |  | (2,842,966) |  |  |  |  |  |  |  |
Beginning balance, shares outstanding (shares) at Dec. 31, 2020 |  |  |  | 30,717,835 |  |  |  |  |  |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  |  |  | 56,325 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | $ 1,899 |  |  |  |  |  |  | 1,899 |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability | (531) |  |  |  |  | $ (531) |  |  |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  |  |  | (27,639) |  | (27,639) |  |  |  |  |  |  |  |
Repurchase of common stock | (5,837) |  |  |  |  | $ (5,837) |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  |  |  | (304,920) |  | (304,920) |  |  |  |  |  |  |  |
Cash dividends declared (common stock, $0.08/share, $0.12/share, $0.44/share, $0.34/share) | (10,433) |  |  |  |  |  |  |  |  |  |  | (10,433) |  |
Net income | 65,346 |  |  |  |  |  |  |  |  |  |  | 65,346 |  |
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (8,433) |  |  |  |  |  |  |  |  | (8,433) |  |  |  |
Balance at end of period at Sep. 30, 2021 | $ 619,055 |  |  | $ 33 |  | $ (125,414) |  | 580,259 |  | (5,357) |  | 169,534 |  |
Ending balance, shares issued (shares) at Sep. 30, 2021 |  |  |  | 33,617,126 |  |  |  |  |  |  |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2021 | (3,175,525) |  |  |  |  | (3,175,525) |  |  |  |  |  |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2021 |  |  |  | 30,441,601 |  |  |  |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2021 | $ 602,977 |  |  | $ 33 |  | $ (120,443) |  | 579,595 |  | (2,859) |  | 146,651 |  |
Beginning balance, shares issued (shares) at Jun. 30, 2021 |  |  |  | 33,617,311 |  |  |  |  |  |  |  |  |  |
Beginning balance, treasury stock (shares) at Jun. 30, 2021 |  |  |  |  |  | (2,919,659) |  |  |  |  |  |  |  |
Beginning balance, shares outstanding (shares) at Jun. 30, 2021 |  |  |  | 30,697,652 |  |  |  |  |  |  |  |  |  |
Restricted stock awards, net of forfeitures (shares) |  |  |  | (185) |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | 664 |  |  |  |  |  |  | 664 |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability | (80) |  |  |  |  | $ (80) |  |  |  |  |  |  |  |
Restricted stock surrendered due to employee tax liability (shares) |  |  |  | (5,946) |  | (5,946) |  |  |  |  |  |  |  |
Repurchase of common stock | (4,891) |  |  |  |  | $ (4,891) |  |  |  |  |  |  |  |
Repurchase of common stock (shares) |  |  |  | (249,920) |  | (249,920) |  |  |  |  |  |  |  |
Cash dividends declared (common stock, $0.08/share, $0.12/share, $0.44/share, $0.34/share) | (3,682) |  |  |  |  |  |  |  |  |  |  | (3,682) |  |
Net income | 26,565 |  |  |  |  |  |  |  |  |  |  | 26,565 |  |
Change in unrealized gain (loss) on securities available for sale, net of income taxes | (2,498) |  |  |  |  |  |  |  |  | (2,498) |  |  |  |
Balance at end of period at Sep. 30, 2021 | $ 619,055 |  |  | $ 33 |  | $ (125,414) |  | $ 580,259 |  | $ (5,357) |  | $ 169,534 |  |
Ending balance, shares issued (shares) at Sep. 30, 2021 |  |  |  | 33,617,126 |  |  |  |  |  |  |  |  |  |
Ending balance, treasury stock (shares) at Sep. 30, 2021 | (3,175,525) |  |  |  |  | (3,175,525) |  |  |  |  |  |  |  |
Ending balance, shares outstanding (shares) at Sep. 30, 2021 |  |  |  | 30,441,601 |  |  |  |  |  |  |  |  |  |

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