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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]      
Cash dividends (in dollars per share) $ 1.77 $ 1.70 $ 1.62
Net exercise of stock options and related tax benefit, shares 39,931 80,681 75,323
Common stock repurchased and returned to unissued status, shares 22,356 67,481 101,466
Shares issued for dividend reinvestment plan. shares 45,148 46,081
Shares issued for employee stock ownership plan, shares 31,435 29,575 31,192
Directors deferred compensation plan, shares 1,871 4,690 5,987
Restricted stock activity, shares 29,511 40,505 94,137
Shares issued for purchase acquisition, shares 32,553 960 1,080