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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Common dividends declared, per share (in dollars per share) $ 0.25 $ 0.25 $ 0.75 $ 0.71
Common stock options exercised, shares (in shares)   3,407   7,752
Issuance of stock to 401(k) plan, shares (in shares) 6,237 3,010 18,148 9,663
Repurchase of common shares, shares (in shares)   60,500 734,653 487,400
Repurchase of common shares, per share (in dollars per share)   $ 33.11 $ 29.77 $ 33.57