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Loans Receivable Held for Investment, Risk Category of Loans by Loan Type (FY) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | $ 365,008 | $ 401,029 | $ 358,485
Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 359,639 | 396,054 | 352,291
Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 2,158 | 822 | 672
Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 35
Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 3,211 | 4,153 | 5,487
Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Single Family [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 73,112 | 92,177
Real Estate [Member] | Single Family [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 73,094 | 92,132
Real Estate [Member] | Single Family [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Single Family [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 35
Real Estate [Member] | Single Family [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 18 | 10
Real Estate [Member] | Single Family [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Single Family [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 289,043 | 233,309
Real Estate [Member] | Multi-Family [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 288,251 | 232,642
Real Estate [Member] | Multi-Family [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 411 | 0
Real Estate [Member] | Multi-Family [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 381 | 667
Real Estate [Member] | Multi-Family [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Multi-Family [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable |  | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 20,086 | 14,818 | 5,800
Real Estate [Member] | Commercial Real Estate [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 18,590 | 14,818 | 5,800
Real Estate [Member] | Commercial Real Estate [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 1,496 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Commercial Real Estate [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Church [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 17,431 | 20,648 | 25,096
Real Estate [Member] | Church [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 13,982 | 16,546 | 19,678
Real Estate [Member] | Church [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 662 | 411 | 672
Real Estate [Member] | Church [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Church [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 2,787 | 3,691 | 4,746
Real Estate [Member] | Church [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Church [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Construction [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 1,672 | 3,125 | 1,872
Real Estate [Member] | Construction [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 1,672 | 3,125 | 1,872
Real Estate [Member] | Construction [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Real Estate [Member] | Construction [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Commercial - Other [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 302 | 262 | 226
Commercial - Other [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 252 | 199 | 162
Commercial - Other [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Commercial - Other [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Commercial - Other [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 50 | 63 | 64
Commercial - Other [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Commercial - Other [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Consumer [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 8 | 21 | 5
Consumer [Member] | Pass [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 8 | 21 | 5
Consumer [Member] | Watch [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Consumer [Member] | Special Mention [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Consumer [Member] | Substandard [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Consumer [Member] | Doubtful [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | 0 | 0 | 0
Consumer [Member] | Loss [Member] |  |  |
Risk Grade Category of Loans by Loan Type [Abstract] |  |  |
Loans receivable | $ 0 | $ 0 | $ 0

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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