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Allowance For Loan Losses (Tables)
3 Months Ended
Mar. 31, 2013
Allowance For Loan Losses [Abstract]  
Summary Of Activity In And The Composition Of The Allowance For Loan Losses By Loan Segment And Class
Summary Of Allowance Amount Required For Loans Individually Evaluated For Impairment And The Amount Required For Loans Collectively Evaluated For Impairment