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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] Springfield Bancshares | Common Stock [Member] Bates Companies | Common Stock [Member] | Additional Paid-in Capital [Member] Springfield Bancshares | Additional Paid-in Capital [Member] Bates Companies | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Springfield Bancshares | Bates Companies | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  |  | $ 13,918 |  |  | $ 189,078 | $ 151,962 | $ (1,671) |  |  | $ 353,287
Net income |  |  |  |  |  |  | 43,120 |  |  |  | 43,120
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  | (3,206) |  |  | (3,206)
Common cash dividends declared |  |  |  |  |  |  | (3,546) |  |  |  | (3,546)
Issuance of shares of common stock as a result of the acquisition, net of issuance cost |  | $ 24 |  |  | $ 976 |  |  |  |  | $ 1,000 |
Issuance of shares of common stock as a result of a merger, net of issuance costs | $ 1,699 |  |  | $ 78,832 |  |  |  |  | $ 80,531 |  |
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  | 15 |  |  | 576 |  |  |  |  | 591
Issuance of shares of common stock as a result of stock options exercised |  |  | 60 |  |  | 734 |  |  |  |  | 794
Stock issuance costs | $ 106,327 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 1,443 |  |  |  |  | 1,443
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes |  |  | $ 23 |  |  | (23) |  |  |  |  |
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes (in shares) |  |  | 22,660 |  |  |  |  |  |  |  |
Exchange of shares of common stock in connection with payroll taxes for restricted stock vested and in connection with stock options exercised |  |  | $ (21) |  |  | (855) |  |  |  |  | (876)
Balance at Dec. 31, 2018 |  |  | 15,718 |  |  | 270,761 | 192,203 | (5,544) |  |  | 473,138
Impact of adoption of ASU 2016-01 |  |  |  |  |  |  | 667 | (667) |  |  |
Net income |  |  |  |  |  |  | 57,408 |  |  |  | 57,408
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  | 4,446 |  |  | 4,446
Common cash dividends declared |  |  |  |  |  |  | (3,775) |  |  |  | (3,775)
Issuance of shares of common stock as a result of the acquisition, net of issuance cost |  | $ 9 |  |  | $ 390 |  |  |  |  | $ 399 |
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  | 29 |  |  | 779 |  |  |  |  | 808
Issuance of shares of common stock as a result of stock options exercised |  |  | 59 |  |  | 660 |  |  |  |  | 719
Stock-based compensation expense |  |  |  |  |  | 2,469 |  |  |  |  | 2,469
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes |  |  | $ 20 |  |  | (63) |  |  |  |  | (43)
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes (in shares) |  |  | 19,869 |  |  |  |  |  |  |  |
Exchange of shares of common stock in connection with payroll taxes for restricted stock vested and in connection with stock options exercised |  |  | $ (7) |  |  | (211) |  |  |  |  | (218)
Balance at Dec. 31, 2019 |  |  | 15,828 |  |  | 274,785 | 245,836 | (1,098) |  |  | 535,351
Impact of adoption of ASU 2016-01 |  |  |  |  |  |  |  |  |  |  | 245,836
Net income |  |  |  |  |  |  | 60,582 |  |  |  | 60,582
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  | 2,474 |  |  | 2,474
Repurchase and cancellation of shares of common stock as a result of share repurchase program |  |  | (101) |  |  | (1,843) | (1,835) |  |  |  | (3,779)
Common cash dividends declared |  |  |  |  |  |  | (3,779) |  |  |  | (3,779)
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  | 37 |  |  | 878 |  |  |  |  | 915
Issuance of shares of common stock as a result of stock options exercised |  |  | 42 |  |  | 403 |  |  |  |  | 445
Stock-based compensation expense |  |  |  |  |  | 2,150 |  |  |  |  | 2,150
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes |  |  | $ 9 |  |  | 304 |  |  |  |  | 313
Restricted stock awards and restricted stock units of common stock , net of restricted stock units withheld for payment for taxes (in shares) |  |  | 8,838 |  |  |  |  |  |  |  |
Exchange of shares of common stock in connection with payroll taxes for restricted stock vested and in connection with stock options exercised |  |  | $ (9) |  |  | (870) |  |  |  |  | (879)
Balance at Dec. 31, 2020 |  |  | $ 15,806 |  |  | $ 275,807 | $ 300,804 | $ 1,376 |  |  | 593,793
Impact of adoption of ASU 2016-01 |  |  |  |  |  |  |  |  |  |  | $ 300,804

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