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Loans and the Allowance for Loan Losses (Allowance for Loan and Lease Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment $ 585 $ 645    
Allowance for loan and lease losses: Collectively evaluated for impairment 9,647 9,592    
Allowance for loan and lease losses: Total 10,232 10,237 9,754 9,602
Loans Receivable: Individually evaluated for impairment 6,894 6,935    
Loans Receivable: Collectively evaluated for impairment 829,206 834,516    
Loans receivable: Loans acquired with discounts related to credit quality 43,153 48,098    
Total Loans Receivable 879,253 889,549    
Commercial and industrial [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 2,083 2,424    
Allowance for loan and lease losses: Total 2,083 2,424 1,784 1,527
Loans Receivable: Collectively evaluated for impairment 183,956 177,644    
Loans receivable: Loans acquired with discounts related to credit quality 3,225 4,038    
Total Loans Receivable 187,181 181,682    
Commercial real estate [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment 474 493    
Allowance for loan and lease losses: Collectively evaluated for impairment 4,879 4,830    
Allowance for loan and lease losses: Total 5,353 5,323 5,876 5,972
Loans Receivable: Individually evaluated for impairment 5,680 5,680    
Loans Receivable: Collectively evaluated for impairment 475,743 470,797    
Loans receivable: Loans acquired with discounts related to credit quality 20,140 20,915    
Total Loans Receivable 501,563 497,392    
Construction [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 284 313    
Allowance for loan and lease losses: Total 284 313 637 707
Loans Receivable: Collectively evaluated for impairment 33,766 38,172    
Loans receivable: Loans acquired with discounts related to credit quality 1,397 2,105    
Total Loans Receivable 35,163 40,277    
Residential mortgage [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Individually evaluated for impairment 111 152    
Allowance for loan and lease losses: Collectively evaluated for impairment 1,267 1,380    
Allowance for loan and lease losses: Total 1,378 1,532 1,234 1,263
Loans Receivable: Individually evaluated for impairment 1,214 1,255    
Loans Receivable: Collectively evaluated for impairment 135,280 146,930    
Loans receivable: Loans acquired with discounts related to credit quality 18,263 20,909    
Total Loans Receivable 154,757 169,094    
Installment [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 103 113    
Allowance for loan and lease losses: Total 103 113 54 51
Loans Receivable: Collectively evaluated for impairment 461 973    
Loans receivable: Loans acquired with discounts related to credit quality 128 131    
Total Loans Receivable 589 1,104    
Unallocated [Member]
       
Financing Receivable, Impaired [Line Items]        
Allowance for loan and lease losses: Collectively evaluated for impairment 1,031 532    
Allowance for loan and lease losses: Total $ 1,031 $ 532 $ 169 $ 82