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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, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment $ 140   $ 645      
Allowance for loan and lease losses: Collectively evaluated for impairment 10,062   9,592      
Allowance for loan and lease losses: Total 10,202 10,232 10,237 10,221 9,754 9,602
Loans Receivable: Individually evaluated for impairment 2,685   6,935      
Loans Receivable: Collectively evaluated for impairment 860,593   834,516      
Loans receivable: Loans acquired with discounts related to credit quality 39,381   48,098      
Total Loans Receivable 902,659   889,549      
Commercial and industrial [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 0   0      
Allowance for loan and lease losses: Collectively evaluated for impairment 2,422   2,424      
Allowance for loan and lease losses: Total 2,422 2,083 2,424 1,747 1,784 1,527
Loans Receivable: Individually evaluated for impairment 0   0      
Loans Receivable: Collectively evaluated for impairment 192,613   177,644      
Loans receivable: Loans acquired with discounts related to credit quality 2,894   4,038      
Total Loans Receivable 195,507   181,682      
Commercial real estate [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 63   493      
Allowance for loan and lease losses: Collectively evaluated for impairment 5,270   4,830      
Allowance for loan and lease losses: Total 5,333 5,353 5,323 6,173 5,876 5,972
Loans Receivable: Individually evaluated for impairment 1,450   5,680      
Loans Receivable: Collectively evaluated for impairment 496,188   470,797      
Loans receivable: Loans acquired with discounts related to credit quality 18,276   20,915      
Total Loans Receivable 515,914   497,392      
Construction [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 0   0      
Allowance for loan and lease losses: Collectively evaluated for impairment 318   313      
Allowance for loan and lease losses: Total 318 284 313 449 637 707
Loans Receivable: Individually evaluated for impairment 0   0      
Loans Receivable: Collectively evaluated for impairment 37,120   38,172      
Loans receivable: Loans acquired with discounts related to credit quality 1,444   2,105      
Total Loans Receivable 38,564   40,277      
Residential mortgage [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 77   152      
Allowance for loan and lease losses: Collectively evaluated for impairment 1,264   1,380      
Allowance for loan and lease losses: Total 1,341 1,378 1,532 1,300 1,234 1,263
Loans Receivable: Individually evaluated for impairment 1,235   1,255      
Loans Receivable: Collectively evaluated for impairment 134,364   146,930      
Loans receivable: Loans acquired with discounts related to credit quality 16,637   20,909      
Total Loans Receivable 152,236   169,094      
Installment [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 0   0      
Allowance for loan and lease losses: Collectively evaluated for impairment 29   113      
Allowance for loan and lease losses: Total 29 103 113 59 54 51
Loans Receivable: Individually evaluated for impairment 0   0      
Loans Receivable: Collectively evaluated for impairment 308   973      
Loans receivable: Loans acquired with discounts related to credit quality 130   131      
Total Loans Receivable 438   1,104      
Unallocated [Member]
           
Financing Receivable, Impaired [Line Items]            
Allowance for loan and lease losses: Individually evaluated for impairment 0   0      
Allowance for loan and lease losses: Collectively evaluated for impairment 759   532      
Allowance for loan and lease losses: Total 759 1,031 532 493 169 82
Loans Receivable: Individually evaluated for impairment 0   0      
Loans Receivable: Collectively evaluated for impairment 0   0      
Loans receivable: Loans acquired with discounts related to credit quality 0   0      
Total Loans Receivable $ 0   $ 0