Loans and the Allowance for Loan Losses (Composition of Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	$ 870,898	$ 755,993
Net deferred loan costs	155	17
Total loans	871,053	756,010
Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	171,493	146,711
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	484,143	408,164
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	40,883	39,388
Residential mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	173,857	160,771
Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Gross loans	$ 522	$ 959