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Commitments, Credit Risk And Contingencies (Tables)
3 Months Ended
Mar. 31, 2012
Commitments, Credit Risk And Contingencies [Abstract]  
Summary Of Off-Balance Sheet Credit Risk Information
     March 31,
2012
     December 31,
2011
 

Commitments to extend credit

   $ 2,149,312       $ 1,943,889   

Standby letters of credit

     109,204         113,268