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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]    
Cash dividends declared (in dollars per share) $ 0.78 $ 0.78
Distribution of shares of treasury stock for directors' compensation (in shares) 7,880 9,532
Distribution of shares of treasury stock for employee stock compensation (in shares) 5,861 7,661
Distribution of shares of treasury stock for directors deferred compensation shares(in shares) 2,438 3,740
Sale of shares of treasury stock (in shares) 11,688 11,857
Restricted stock awards, forfeited (in shares) 1,139