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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

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