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Investment Securities (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
security
Mar. 31, 2017
USD ($)
security
Jun. 30, 2017
USD ($)
security
financial_institution
Jun. 30, 2016
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Held-to-maturity Securities [Line Items]            
Proceeds from sales of securities held to maturity     $ 606,000 $ 0    
Schedule of Available-for-sale Securities [Line Items]            
Restricted stock $ 4,100,000   4,100,000     $ 4,000,000.0
Federal Home Loan Bank, stock $ 4,000,000.0   $ 4,000,000.0     3,900,000
Other than temporary impairment         $ 865,000  
Other than temporary impairment loss, portion recognized in earnings         364,000  
Other than temporary impairment loss, portion in other comprehensive loss         $ 501,000  
Mortgage Backed Securities [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Number of mortgage backed securities sold | security 7          
Total mortgage backed securities sold $ 4,200,000          
Loss realized on sale $ 1,740          
Trust preferred debt securities – single issuer [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Number of corporate trust preferred securities issued | security 4   4      
Number of issuers of corporate trust preferred securities | financial_institution     2      
Trust preferred debt securities-pooled [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Number of issuers of corporate trust preferred securities | financial_institution     2      
Mortgage Backed Securities [Member]            
Schedule of Held-to-maturity Securities [Line Items]            
Number of securities sold | security   54        
Proceeds from sales of securities held to maturity   $ 2,000,000.0        
Total amount of securities sold (less than $150,000)   $ 150,000        
Six Mortgage Backed Securities [Member] | Mortgage Backed Securities [Member]            
Schedule of Held-to-maturity Securities [Line Items]            
Number of securities sold | security   6        
Total amount of securities sold (less than $150,000)   $ 582,000        
Net gain   $ 24,000        
Percentage of original principal balance outstanding at the time of purchase (less than 15%)   15.00%        
Atlantic Community Bankers Bank Stock [Member] | Bankers Bank Stock [Member]            
Schedule of Available-for-sale Securities [Line Items]            
Bankers Bank Stock $ 65,000   $ 65,000     $ 65,000