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Allowance for Loan Losses and Credit Quality Indicators (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Loans and Allowance for Loan Losses and Credit Quality Indicators (Textual) [Abstract]          
Minimum commercial loan relationships to be reviewed by loan review function $ 2,000,000   $ 2,000,000    
Total loan restructurings 6,860,000   6,860,000   9,450,000
Net nonaccrual status 2,180,000   2,180,000   3,270,000
Allowance for loan losses 675,000   675,000   1,140,000
Interest income recognized on loan restructurings 62,000 79,000 237,000 428,000  
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000   250,000    
Payment defaults on loans modified as TDRs 0 0 0 0  
Time period for restructuring     12 months    
Nonperforming TDRs 121,000   121,000   600,000
Percentage of Total TDR 17.60%   17.60%   6.35%
Performing status returned period     6 months    
Accruing loans     0    
Accruing loans contractually past due 90 days or more 23,717,000   23,717,000   13,935,000
Payment performance period     6 months    
Nonaccrual loans maximum period     29 days    
Nonaccrual loans minimum period     0 days    
Covered loans recorded as TDRs $ 0   $ 0