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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.48 $ 0.45
Net exercise of stock options and related tax benefit (in shares) 1,670 7,372
Common stock repurchased and returned to unissued status (in shares) 15,500  
Shares issued for dividend reinvestment plan (in shares)   11,343
Shares issued for employee stock ownership plan (in shares) 38,883 27,412
Directors deferred compensation plan (in shares) 4,218 2,552
Restricted stock activity (in shares) 5,332 1,027