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Contingent Liabilities (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Aug. 01, 2009
Nov. 30, 2016
item
Jul. 31, 2015
item
Sep. 30, 2013
item
Dec. 31, 2005
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Contingent Liabilities [Line Items]              
Total expense | $           $ 1,746  
Rental expense | $           $ 692 $ 569
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) 1 year 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)           6 years 6 months  
Total expense | $           $ 1,543  
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)         3 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)       6 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)     19 years        
Number of option periods     2        
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)   14 years          
Number of option periods   2