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Loans and Related Allowance for Loan Losses (Primary Segments of the Allowance for Loan Loss) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 1,445   $ 260      
Collectively evaluated for impairment 9,310   9,658      
Total allowance for loan losses 10,755 $ 9,922 9,918 $ 12,044 $ 12,678 $ 11,922
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 1,337   177      
Collectively evaluated for impairment 3,200   3,736      
Total allowance for loan losses 4,537 3,649 3,913 5,524 4,405 2,580
Acquisition and Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 34   40      
Collectively evaluated for impairment 1,150   831      
Total allowance for loan losses 1,184 1,200 871 1,266 3,118 4,129
Commercial and industrial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 804   858      
Total allowance for loan losses 804 836 858 890 737 722
Residential Mortgage [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 74   43      
Collectively evaluated for impairment 3,460   3,545      
Total allowance for loan losses 3,534 3,545 3,588 3,665 3,723 3,785
Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 196   188      
Total allowance for loan losses 196 192 188 199 195 206
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 500   500      
Total allowance for loan losses $ 500 $ 500 $ 500 $ 500 $ 500 $ 500