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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Cash dividends declared per common share (in dollars per share) | $ 0.06 |  |  | $ 0.06 |  |
Common Stock [Member] |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 5,674 | 11,346 | 4,446 | 3,205 | 5,728 | 2,669
Issuance of shares of common stock as s result of stock options exercised (in shares) | 12,438 | 2,414 | 25,238 | 1,754 | 26,641 | 13,074
Restricted stock awards (in shares) |  | 4,769 | 12,719 | 5,300 | 3,972 | 6,860
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) | 589 | 1,032 | 5,169 | 9,853 | 642 | 3,814
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 |  |

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