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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, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 315   $ 362      
Collectively evaluated for impairment 10,008   9,610      
Total allowance for loan losses 10,323 $ 9,769 9,972 $ 10,755 $ 9,922 $ 9,918
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 170   245      
Collectively evaluated for impairment 2,643   3,454      
Total allowance for loan losses 2,813 3,303 3,699 4,537 3,649 3,913
Acquisition and Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 26   40      
Collectively evaluated for impairment 1,469   1,217      
Total allowance for loan losses 1,495 1,172 1,257 1,184 1,200 871
Commercial and industrial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 1,001   869      
Total allowance for loan losses 1,001 786 869 804 836 858
Residential Mortgage [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 116   65      
Collectively evaluated for impairment 4,102   3,379      
Total allowance for loan losses 4,218 3,744 3,444 3,534 3,545 3,588
Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 3   12      
Collectively evaluated for impairment 293   191      
Total allowance for loan losses 296 264 203 196 192 188
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