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Contingent Liabilities (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 01, 2009
Nov. 30, 2016
item
Aug. 31, 2016
Jul. 31, 2015
item
Sep. 30, 2013
item
Dec. 31, 2005
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Contingent Liabilities [Line Items]                
Total expense | $             $ 2,377  
Rental expense | $             $ 569 $ 530
Banking Facility [Member]                
Contingent Liabilities [Line Items]                
Number of leases             6  
Commercial Loan Production Office [Member]                
Contingent Liabilities [Line Items]                
Number of leases             1  
615 Church Street [Member]                
Contingent Liabilities [Line Items]                
Period of lease 10 years              
Remaining period on lease (in years) 2 years 6 months              
828 Main Street [Member]                
Contingent Liabilities [Line Items]                
Period of lease             10 years  
Number of renewals             2  
Period of renewal (in years)             5 years  
Period of lease after of renewal options (in years)             20 years  
Remaining period on lease (in years)             7 years 6 months  
Total expense | $             $ 1,755  
4935 Boonsboro Road [Member]                
Contingent Liabilities [Line Items]                
Period of lease           5 years    
Number of renewals           2    
Period of lease after of renewal options (in years)           15 years    
Remaining period on lease (in years)           4 years    
1430 Rolkin Court [Member]                
Contingent Liabilities [Line Items]                
Period of lease         5 years      
Number of renewals         1      
Period of lease after of renewal options (in years)         10 years      
Remaining period on lease (in years)         7 years      
Number of option periods         1      
225 Merchant Walk Avenue [Member]                
Contingent Liabilities [Line Items]                
Period of lease       10 years        
Number of renewals       2        
Period of renewal (in years)       5 years        
Period of lease after of renewal options (in years)       20 years        
Remaining period on lease (in years)       20 years        
Number of option periods       2        
180 Old Courthouse Road [Member]                
Contingent Liabilities [Line Items]                
Period of lease     6 months          
3564 Electric Road [Member]                
Contingent Liabilities [Line Items]                
Period of lease   5 years            
Number of renewals   2            
Period of renewal (in years)   5 years            
Period of lease after of renewal options (in years)   15 years            
Remaining period on lease (in years)   15 years            
Number of option periods   2