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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.96 $ 0.90
Net exercise of stock options and related tax benefit (in shares) 4,843 10,035
Common stock repurchased and returned to unissued status (in shares) 15,500  
Shares issued for dividend reinvestment plan (in shares)   24,075
Shares issued for employee stock ownership plan (in shares) 38,883 27,412
Directors deferred compensation plan (in shares) 2,251 695
Restricted stock activity (in shares) 15,410 7,975