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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
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) 9,673 8,385
Distribution of shares of treasury stock for employee restricted stock awards (in shares) 990
Distribution of shares of treasury stock for employee stock compensation (in shares) 3,303 3,595
Sale of shares of treasury stock (in shares) 11,775
Distribution of shares of treasury stock for directors' deferred compensation (in shares) 3,598 3,467