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Loans And Allowance For Loan Losses (Narrative) (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Day
Jun. 30, 2012
Day
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Overdrafts reclassified as part of gross loans $ 13,000 $ 13,000 $ 7,000
Loans with an assigned risk grade 500,000 500,000  
Days, Loans placed on nonaccrual status become past due 90 90  
Loans classified as trouble debt restructurings $ 6,600,000 $ 6,600,000 $ 6,600,000