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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Increase (Decrease) in Shareholders' Equity [Roll Forward]    
Cash dividends declared (in dollars per share) $ 0.52 $ 0.52
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) 9,814  
Distribution of shares of treasury stock for directors' deferred compensation (in shares) 3,598 3,467