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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited)    
Common stock cash dividends declared (in dollars per share) $ 0.325 $ 0.31
Treasury shares purchased under deferred directors' plan (in shares) 7,204 5,058
Treasury stock shares sold (in shares)   30,100
Stock activity under stock compensation plans (in shares) 114,928 34,000