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Loans and the Allowance for Loan Losses (Allowance for Loan and Lease Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment   $ 1,085    
Allowance for loan and lease losses: Collectively evaluated for impairment   8,517    
Allowance for loan and lease losses: Total 10,237 9,602 8,867 8,711
Loans Receivable: Individually evaluated for impairment   13,946    
Loans Receivable: Collectively evaluated for impairment   741,029    
Total Loans Receivable 889,549 754,975    
Commercial and industrial [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 2,424 1,527    
Allowance for loan and lease losses: Total 2,424 1,527 1,272  
Loans Receivable: Collectively evaluated for impairment 177,644 146,711    
Loans receivable: Loans acquired with discounts related to credit quality 4,038      
Total Loans Receivable 181,682 146,711    
Commercial Real Estate Portfolio Segment [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment 493 567    
Allowance for loan and lease losses: Collectively evaluated for impairment 4,830 5,405    
Allowance for loan and lease losses: Total 5,323 5,972 5,715  
Loans Receivable: Individually evaluated for impairment 5,680 6,301    
Loans Receivable: Collectively evaluated for impairment 470,797 401,863    
Loans receivable: Loans acquired with discounts related to credit quality 20,915      
Total Loans Receivable 497,392 408,164    
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 313 507    
Allowance for loan and lease losses: Total 313 707 551  
Loans Receivable: Individually evaluated for impairment   3,044    
Loans Receivable: Collectively evaluated for impairment 38,172 36,344    
Loans receivable: Loans acquired with discounts related to credit quality 2,105      
Total Loans Receivable 40,277 39,388    
Residential Portfolio Segment [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment 152 318    
Allowance for loan and lease losses: Collectively evaluated for impairment 1,380 945    
Allowance for loan and lease losses: Total 1,532 1,263 1,038  
Loans Receivable: Individually evaluated for impairment 1,255 4,601    
Loans Receivable: Collectively evaluated for impairment 146,930 155,152    
Loans receivable: Loans acquired with discounts related to credit quality 20,909      
Total Loans Receivable 169,094 159,753    
Installment [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 113 51    
Allowance for loan and lease losses: Total 113 51 52  
Loans Receivable: Collectively evaluated for impairment 973 959    
Loans receivable: Loans acquired with discounts related to credit quality 131      
Total Loans Receivable 1,104 959    
Unallocated [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 532 82    
Allowance for loan and lease losses: Total $ 532 $ 82 $ 239