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Loans and the Allowance for Loan Losses (Allowance for Loan and Lease Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment $ 871   $ 1,085      
Allowance for loan and lease losses: Collectively evaluated for impairment 9,350   8,517      
Allowance for loan and lease losses: Total 10,221 9,754 9,602 9,836 9,591 8,867
Loans Receivable: Individually evaluated for impairment 20,178   21,816      
Loans Receivable: Collectively evaluated for impairment 787,113   734,177      
Total Loans Receivable 807,291   755,993      
Commercial and industrial [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Collectively evaluated for impairment 1,747   1,527      
Allowance for loan and lease losses: Total 1,747 1,784 1,527 1,376 1,378 1,272
Loans Receivable: Individually evaluated for impairment 841   953      
Loans Receivable: Collectively evaluated for impairment 167,296   145,758      
Total Loans Receivable 168,137   146,711      
Commercial real estate [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 531   567      
Allowance for loan and lease losses: Collectively evaluated for impairment 5,642   5,405      
Allowance for loan and lease losses: Total 6,173 5,876 5,972 6,155 6,183 5,715
Loans Receivable: Individually evaluated for impairment 11,250   12,769      
Loans Receivable: Collectively evaluated for impairment 437,374   395,395      
Total Loans Receivable 448,624   408,164      
Construction [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment     200      
Allowance for loan and lease losses: Collectively evaluated for impairment 449   507      
Allowance for loan and lease losses: Total 449 637 707 1,130 900 551
Loans Receivable: Individually evaluated for impairment 3,600   3,044      
Loans Receivable: Collectively evaluated for impairment 29,921   36,344      
Total Loans Receivable 33,521   39,388      
Residential mortgage [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 340   318      
Allowance for loan and lease losses: Collectively evaluated for impairment 960   945      
Allowance for loan and lease losses: Total 1,300 1,234 1,263 1,005 952 1,038
Loans Receivable: Individually evaluated for impairment 4,487   5,050      
Loans Receivable: Collectively evaluated for impairment 152,177   155,721      
Total Loans Receivable 156,664   160,771      
Installment [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Collectively evaluated for impairment 59   51      
Allowance for loan and lease losses: Total 59 54 51 56 51 52
Loans Receivable: Collectively evaluated for impairment 345   959      
Total Loans Receivable 345   959      
Unallocated [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Collectively evaluated for impairment 493   82      
Allowance for loan and lease losses: Total $ 493 $ 169 $ 82 $ 114 $ 127 $ 239