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Non-performing Loans and Impaired Loans (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2013
Contract
ConsecutivePayment
Dec. 31, 2012
Non-Performing Loans and Impaired Loans (Additional Textual) [Abstract]    
Non-accrual loans $ 13,855,000 $ 13,374,000
Non-performing TDR's 6,600,000  
Loans acquired included in non-accrual loans 1,700,000  
Loans acquired included in non-performing TDR's 841,000  
Restructured loans with modified recorded balances 0  
Minimum period required for satisfactory performance before returning to accrual status 6 months  
Restructured loan returned to accruing status number of Consecutive Payments of loan 6  
Restructured loan reported in TDRs 11,700,000  
Number TDR's returned to accrual status 0  
Specific reserves allocated to troubled debt restructuring 2,200,000  
Loans with an aggregate credit exposure 500,000  
Loans classified as TDR after a period 90 days  
Loan delinquent period 90 days  
Maximum [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Delay or shortfall in payments of loan 30 days or more  
Minimum [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Period for loans moved to non accrual status 90 days or more  
Performing Financing Receivable [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Restructured loan $ 5,100,000  
Good Pass [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating 5 years  
Number of years of Satisfactory Relationship with bank for Good Pass Rating 5 years  
Good Pass [Member] | Minimum [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Number of consecutive years of profit for Good Pass Rating 3 years  
Satisfactory Pass [Member] | Minimum [Member]
    
Non-Performing Loans and Impaired Loans (Textual) [Abstract]    
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating 2 years