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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash dividends declared per common share (in dollars per share) | $ 0.24 | $ 0.24 | $ 0.24
Issuance of shares of common stock as s result of stock options exercised (in shares) | 41,650 | 59,393 | 60,127
Bates Companies |  |  |
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 | $ 0.24
Common Stock [Member] |  |  |
Repurchase and cancellation of common stock as a result of share repurchase program (in shares) | 100,932 |  |
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 37,114 | 28,775 | 15,528
Issuance of shares of common stock as s result of stock options exercised (in shares) | 41,650 | 59,393 | 60,127
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) | 9,057 | 7,547 | 21,190
Common Stock [Member] | Springfield Bancshares |  |  |
Issuance of common stock, net of issuance costs, shares (in shares) |  |  | 1,699,414
Stock issuance costs |  |  | $ 106,327
Common Stock [Member] | Bates Companies |  |  |
Issuance of shares of common stock as a result of the acquisition, net of issuance cost (in shares) |  | 9,400 | 23,501
Issuance of common stock, net of issuance costs, shares (in shares) |  | 9,400 |

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