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Loans Receivable Held for Investment, Recorded Investment in Non-accrual Loans by Loan Type (Q3) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Loans Receivable Held for Investment [Abstract] |  |  |
Total non-accrual loans | $ 820 | $ 424 | $ 911
Loans 90 days or more delinquent that were accruing interest | 0 | 0 | 0
Real Estate [Member] | Single Family [Member] |  |  |
Loans Receivable Held for Investment [Abstract] |  |  |
Total non-accrual loans | 8 | 18 |
Real Estate [Member] | Church [Member] |  |  |
Loans Receivable Held for Investment [Abstract] |  |  |
Total non-accrual loans | $ 812 | $ 406 | $ 911

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