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Loans Receivable Held for Investment, Loans Individually Evaluated for Impairment by Loan Type (Q3) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
With an Allowance Recorded [Abstract]      
Allowance for loan losses allocated $ 148 $ 147 $ 227
Total [Abstract]      
Unpaid principal balance 5,348 6,388 8,243
Recorded investment 4,799 5,343 6,380
Real Estate [Member] | Single Family [Member]      
With No Related Allowance Recorded [Abstract]      
Unpaid principal balance 9 0  
Recorded investment 8 0  
With an Allowance Recorded [Abstract]      
Unpaid principal balance 578 593  
Recorded investment 578 593  
Allowance for loan losses allocated 91 60  
Real Estate [Member] | Multi-Family [Member]      
With No Related Allowance Recorded [Abstract]      
Unpaid principal balance 304 313  
Recorded investment 304 313  
Real Estate [Member] | Church [Member]      
With No Related Allowance Recorded [Abstract]      
Unpaid principal balance 2,546 3,491 4,666
Recorded investment 1,999 2,446 2,803
With an Allowance Recorded [Abstract]      
Unpaid principal balance 1,861 1,928 2,580
Recorded investment 1,861 1,928 2,580
Allowance for loan losses allocated 56 85 170
Commercial - Other [Member]      
With an Allowance Recorded [Abstract]      
Unpaid principal balance 50 63 64
Recorded investment 49 63 64
Allowance for loan losses allocated $ 1 $ 2 $ 4