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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Common dividends declared, per share (in dollars per share) $ 0.25 $ 0.21
Common stock options exercised, shares (in shares)   1,418
Issuance of stock to 401(k) plan, shares (in shares) 6,617 4,098
Repurchase of common shares, shares (in shares) 734,653 232,900
Repurchase of common shares, per share (in dollars per share) $ 29.77 $ 33.41