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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
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) 6,015 7,880
Distribution of shares of treasury stock for employee stock compensation (in shares) 1,784 5,861
Distribution of shares of treasury stock for directors deferred compensation shares (in shares) 36,861 2,438
Sale of shares of treasury stock (in shares) 9,938 11,688
Restricted stock awards, forfeited (in shares)   1,139