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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019
Issuance of shares for acquisition (in shares) |  |  |  | 416,478
Shares issued per share (in dollars per share) |  |  |  | $ 42
Cash dividends per share (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.30
Shares of restricted stock awards surrendered (in shares) |  | 1,904 | 1,245 |

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