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Loans Receivable and Allowance for Loan Losses (Summary of Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 122,125 $ 131,049  
Deferred loan fees, net (537) (631)  
Loan discount (232) (182)  
Allowance for loan losses (1,523) (1,393) $ (2,480)
Loans, net 119,833 128,843  
Real Estate Secured [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 121,976 130,889  
Unsecured [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 149 $ 160