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Loans Receivable Held for Investment, Aging of Recorded Investment in Past Due Loans by Loan Type (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | $ 84 | $ 18 | $ 35
Current | 364,924 | 401,011 | 358,450
Gross loans receivable | 365,008 | 401,029 | 358,485
30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 76 | 18 | 35
60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 8 | 0 | 0
Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Single Family [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 18 | 35
Current |  | 73,094 | 92,142
Gross loans receivable |  | 73,112 | 92,177
Real Estate [Member] | Single Family [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 18 | 35
Real Estate [Member] | Single Family [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Real Estate [Member] | Single Family [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Current |  | 289,043 | 233,309
Gross loans receivable |  | 289,043 | 233,309
Real Estate [Member] | Multi-Family [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due |  | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Current | 20,086 | 14,818 | 5,800
Gross loans receivable | 20,086 | 14,818 | 5,800
Real Estate [Member] | Commercial Real Estate [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Church [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Current | 17,431 | 20,648 | 25,096
Gross loans receivable | 17,431 | 20,648 | 25,096
Real Estate [Member] | Church [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Church [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Church [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Construction [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Current | 1,672 | 3,125 | 1,872
Gross loans receivable | 1,672 | 3,125 | 1,872
Real Estate [Member] | Construction [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Commercial - Other [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Current | 302 | 262 | 226
Gross loans receivable | 302 | 262 | 226
Commercial - Other [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Commercial - Other [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Commercial - Other [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Consumer [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Current | 8 | 21 | 5
Gross loans receivable | 8 | 21 | 5
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | 0 | 0 | 0
Consumer [Member] | Greater than 90 Days Past Due [Member] |  |  |
Aging of Recorded Investment in Past Due Loans by Loan Type [Abstract] |  |  |
Total Past Due | $ 0 | $ 0 | $ 0

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