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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 40 39
Post-modification outstanding balance $ 8,687 $ 23,022
Net charge-offs resulting from modification 0 (1)
Defaulted restructured loans, number of loans 7 10
Defaulted Restructured loans, recorded investment 427 6,862
Commercial Construction [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 5 7
Post-modification outstanding balance 557 3,457
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans   2
Defaulted Restructured loans, recorded investment   3,913
Commercial Secured by Real Estate [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 11 19
Post-modification outstanding balance 4,506 17,497
Net charge-offs resulting from modification 0 0
Defaulted restructured loans, number of loans 1 2
Defaulted Restructured loans, recorded investment 344 1,669
Commercial Other [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 23 13
Post-modification outstanding balance 3,233 2,068
Net charge-offs resulting from modification 0 (1)
Defaulted restructured loans, number of loans 6 6
Defaulted Restructured loans, recorded investment 83 1,280
Real Estate Mortgage [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of troubled debt restructuring that occurred during the period 1  
Post-modification outstanding balance 391  
Net charge-offs resulting from modification $ 0