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Loans and the Allowance for Loan Losses (Composition of Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans $ 879,253 $ 889,549
Net deferred loan costs 134 123
Total loans 879,387 889,672
Commercial and industrial [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 187,181 181,682
Commercial real estate [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 501,563 497,392
Construction [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 35,163 40,277
Residential mortgage [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 154,757 169,094
Installment [Member]
   
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans $ 589 $ 1,104