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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common dividends declared, per share (in dollars per share) $ 1.00 $ 0.96 $ 0.78
Special common dividends declared, per share (in dollars per share)     $ 0.48
Common stock options exercised, shares (in shares) (0) 8,459 24,186
Issuance of stock to 401(k) plan, shares (in shares) 22,693 12,407 11,331
Purchase of treasury shares, shares (in shares)     1,060,312
Purchase of treasury shares, per share (in dollars per share)     $ 32.45
Repurchase of common shares, shares (in shares) 734,653 487,400  
Repurchase of common shares, per share (in dollars per share) $ 29.77 $ 33.57