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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]        
Dividend declared per share $ 0.30 $ 0.30 $ 0.60 $ 0.57
Acquisition of treasury stock, shares   39,600 36,401 54,763
Treasury shares issued under employee stock purchase plan, shares   2,110   2,260
Treasury shares issued under dividend reinvestment plan, shares 14,964 9,554 35,088 19,704
Treasury shares issued, shares     71  
Common shares issued, shares     973  
Incentive stock options exercised, shares       6,982