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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Common dividends declared, per share (in dollars per share) $ 0.25 $ 0.25 $ 0.50 $ 0.46
Common stock options exercised, shares (in shares)   2,927   4,345
Issuance of stock to 401(k) plan, shares (in shares) 5,294 2,555 11,911 6,653
Repurchase of common shares, shares (in shares)   194,000 734,653 426,900
Repurchase of common shares, per share (in dollars per share)   $ 33.90 $ 29.77 $ 33.63