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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock dividends, per share $ 1.25 $ 1.17 $ 1.095
Stock options exercised, shares 16,361 45,154 78,035
Restricted stock grants, shares 3,370 1,380  
Treasury Stock [Member]
      
Purchase of treasury stock, shares 700 5,383 22,087