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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
loan
Sep. 30, 2020
USD ($)
segment
loan
item
Sep. 30, 2019
loan
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of loan categories | item   4    
Loan interest rate   6.51%   6.44%
Number of loan portfolio segments | segment   1    
Loans modified, number of new loans 2      
Loans modified, number of loans charged off 1      
Number of restructured loans past maturity   1    
Funds committed to be advanced in connection with impaired loans | $   $ 0    
Number of loans deferred, CARES Act   40    
Number of deferred loans for which repayment has not resumed, CARES Act   4    
Interest Only Payments [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of restructured loans   1    
Interest Rate Reduction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of restructured loans     1  
Extended Maturity Date [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of restructured loans     1  
New Loan and Interest Rate Reduction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of restructured loans 2