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Fair Value, Assets Measured on Recurring Basis Borrowings (Q3) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | $ 10,372 |  | $ 10,372 |  | $ 11,006 | $ 14,722
Transfer between level 1 and level 2 | 0 | $ 0 | 0 | $ 0 | 0 | 0
Transfer between level 2 and level 1 | 0 | 0 | 0 | 0 | 0 | 0
Transfer into level 3 | 0 | 0 | 0 | 0 | 0 | 0
Transfer out of level 3 | 0 | $ 0 | 0 | $ 0 | 0 | 0
Federal Agency Mortgage-backed [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 6,460 |  | 6,460 |  | 7,956 | 9,508
Federal Agency Debt [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 3,058 |  | 3,058 |  | 3,050 | 5,214
Municipal Bonds [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 854 |  | 854 |  |  |
Recurring Basis [Member] | Federal Agency Mortgage-backed [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 6,460 |  | 6,460 |  | 7,956 | 9,508
Recurring Basis [Member] | Federal Agency Debt [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 3,058 |  | 3,058 |  | 3,050 | 5,214
Recurring Basis [Member] | Municipal Bonds [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 854 |  | 854 |  |  |
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal Agency Mortgage-backed [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  | 0 | 0
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal Agency Debt [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  | 0 | 1,979
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal Bonds [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  |  |
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Mortgage-backed [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 6,460 |  | 6,460 |  | 7,956 | 9,508
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal Agency Debt [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 3,058 |  | 3,058 |  | 3,050 | 3,235
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Municipal Bonds [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 854 |  | 854 |  |  |
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal Agency Mortgage-backed [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  | 0 | 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal Agency Debt [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  | $ 0 | $ 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal Bonds [Member] |  |  |  |  |  |
Assets Measured on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | $ 0 |  | $ 0 |  |  |

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