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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends (in dollars per share) $ 0.90 $ 0.88
Net exercise of stock options and related tax benefit, shares 10,035 12,168
Common stock repurchased and returned to unissued status, shares   22,356
Shares issued for dividend reinvestment plan (in shares) 24,075 15,516
Shares issued for employee stock ownership plan, shares 27,412 31,435
Directors deferred compensation plan, shares 695 2,016
Restricted stock activity, shares 7,975 13,631
Shares issued for purchase acquisition, shares   32,553