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Investment Securities (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Investment in Federal Home Loan and Atlantic Central Bankers Bank stock recorded at cost $ 5,300,000 $ 1,100,000  
Gross gains on sales of securities 0 41,000 $ 2,700,000
Gross losses on sales of securities 0 0 429,000
Other than temporary impairment charges on one trust preferred pool security $ 0 $ 0 $ 0
Number of securities | item 1 1  
Book value $ 84,387,000 $ 84,432,000  
Fair value 83,002,000 83,391,000  
Federal Home Loan Bank Advances [Member]      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Investment securities pledged as collateral 262,000,000 116,000,000  
Federal Reserve Bank Advances [Member]      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Investment securities pledged as collateral $ 0 $ 169,500,000  
Single Issuers [Member]      
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]      
Number of securities | item 1 1  
Book value $ 9,200,000    
Fair value $ 7,152,000 $ 7,278,000