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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 17 21
Financing receivable modifications post-modification recorded investment during the period $ 2,303 $ 4,016
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans 5 10
Defaulted Restructured loans, recorded investment 68 470
Commercial Construction [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 5 5
Financing receivable modifications post-modification recorded investment during the period 557 557
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans 1 4
Defaulted Restructured loans, recorded investment 54 424
Commercial Secured By Real Estate [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 2 5
Financing receivable modifications post-modification recorded investment during the period 728 2,393
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans 0 0
Defaulted Restructured loans, recorded investment 0 0
Commercial Other [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 10 11
Financing receivable modifications post-modification recorded investment during the period 1,018 1,066
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans 4 6
Defaulted Restructured loans, recorded investment $ 14 $ 46