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Loans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, related parties $ 18,600,000 $ 10,300,000  
Loans, related parties, new borrowings 9,800,000    
Loans, related parties, repayments and other reductions 1,600,000    
Past due greater than 90 days and still accruing interest 0 0  
Interest income recognized on nonaccrual loans 0 0 $ 0
Estimated interest income $ 508,000 $ 294,000 $ 481,000
Number of loans modified as TDR | contract 0 0  
Number of loans modified as TDR that defaulted | contract 0 0  
Days past due when loans are generally placed on nonaccrual status, in days 90 days 90 days  
Consumer Overdrafts [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due greater than 90 days and still accruing interest $ 6,000 $ 8,000