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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash dividends declared per common share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.20
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 28,775 |  |
Issuance of shares of common stock as s result of stock options exercised (in shares) | 59,393 | 60,127 | 114,100
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) | 7,547 |  |
Bates Companies [Member] |  |  |
Issuance of common stock, net of issuance costs, shares (in shares) |  | 23,501 |
Retained Earnings [Member] |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.20
Common Stock [Member] |  |  |
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) |  | 15,528 | 13,318
Issuance of shares of common stock as s result of stock options exercised (in shares) | 59,393 |  | 114,100
Restricted stock awards (in shares) | 19,869 | 22,660 | 28,289
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) |  | 21,190 | 23,054
Common Stock [Member] | Guaranty Bank and Trust Company [Member] |  |  |
Issuance of shares of common stock, net of issuance costs |  |  | $ 138,071
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares) |  |  | 678,000
Common Stock [Member] | Springfield Bancshares |  |  |
Issuance of shares of common stock, net of issuance costs |  | $ 106,237 |
Issuance of common stock, net of issuance costs, shares (in shares) |  | 1,699,414 |
Common Stock [Member] | Bates Companies [Member] |  |  |
Issuance of common stock, net of issuance costs, shares (in shares) | 9,400 |  |
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares) |  | 23,501 |

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