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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 1.35 $ 1.32
Net exercise of stock options and related tax benefit, (in shares) 12,677 19,018
Common stock repurchased and returned to unissued status (in shares)   22,356
Shares issued for dividend reinvestment plan (in shares) 34,750 33,124
Shares issued for employee stock ownership plan (in shares) 27,412 31,435
Directors deferred compensation plan (in shares) 1,145 77
Restricted stock activity (in shares) 8,301 17,504
Shares issued for purchase acquisition (in shares)   32,553