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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] Springfield Bancshares | Common Stock [Member] Bates Companies [Member] | Common Stock [Member] Guaranty Bank and Trust Company [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] Springfield Bancshares | Additional Paid-in Capital [Member] Bates Companies [Member] | Additional Paid-in Capital [Member] Guaranty Bank and Trust Company [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Springfield Bancshares | Bates Companies [Member] | Guaranty Bank and Trust Company [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 |  |  |  | $ 13,107 |  |  |  | $ 156,777 | $ 118,617 | $ (2,460) |  |  |  | $ 286,041
Net income |  |  |  |  |  |  |  |  | 35,707 |  |  |  |  | 35,707
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  | 1,092 |  |  |  | 1,092
Reclassification of certain tax effects from accumulated other comprehensive income |  |  |  |  |  |  |  |  | 303 | (303) |  |  |  |
Common cash dividends declared |  |  |  |  |  |  |  |  | (2,665) |  |  |  |  | (2,665)
Issuance of shares of common stock as a result of the acquisition, net of issuance cost |  |  | $ 679 |  |  |  | $ 30,063 |  |  |  |  |  | $ 30,742 |
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  | 13 |  |  |  | 455 |  |  |  |  |  | 468
Issuance of shares of common stock as a result of stock options exercised |  |  |  | 114 |  |  |  | 1,611 |  |  |  |  |  | 1,725
Stock-based compensation expense |  |  |  |  |  |  |  | 1,187 |  |  |  |  |  | 1,187
Restricted stock awards - shares of common stock |  |  |  | 28 |  |  |  | (28) |  |  |  |  |  |
Exchange of shares of common stock in connection with payroll taxes for restricted stock and in connection with stock options exercised |  |  |  | (23) |  |  |  | (987) |  |  |  |  |  | (1,010)
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)
Impact of adoption of ASU 2016-01 |  |  |  |  |  |  |  |  | 667 | (667) |  |  |  |
Common cash dividends declared |  |  |  |  |  |  |  |  | (3,546) |  |  |  |  | (3,546)
Issuance of shares of common stock as a result of the acquisition, net of issuance cost | $ 1,699 | $ 24 |  |  | $ 78,832 | $ 976 |  |  |  |  | $ 80,531 | $ 1,000 |  |
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-based compensation expense |  |  |  |  |  |  |  | 1,443 |  |  |  |  |  | 1,443
Restricted stock awards - shares of common stock |  |  |  | 23 |  |  |  | (23) |  |  |  |  |  |
Exchange of shares of common stock in connection with payroll taxes for restricted stock 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
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 - shares of common stock |  |  |  | 20 |  |  |  | (63) |  |  |  |  |  | (43)
Exchange of shares of common stock in connection with payroll taxes for restricted stock 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

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