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Loans Receivable Held for Investment, Loans Individually Evaluated for Impairment by Loan Type (FY) (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 an Allowance Recorded [Abstract]      
Unpaid principal balance   593 610
Recorded investment   593 610
Allowance for loan losses allocated   60 53
Real Estate [Member] | Multi-Family [Member]      
With No Related Allowance Recorded [Abstract]      
Unpaid principal balance   313 323
Recorded investment   313 323
With an Allowance Recorded [Abstract]      
Unpaid principal balance   0 0
Recorded investment   0 0
Allowance for loan losses allocated   0 0
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