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Fair Value, Assets Measured on Non-Recurring Basis (FY) (Details) - Non-Recurring Basis [Member] - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020
Assets Measured on Non-Recurring Basis [Abstract] |  |  |
Losses recognized on assets measured at fair value on a non-recurring basis | $ 0 | $ 45 |
Impaired Loans Carried at Fair Value of Collateral [Member] |  |  |
Assets Measured on Non-Recurring Basis [Abstract] |  |  |
Assets, fair value | 130 | 591 | $ 0
Losses recognized on assets measured at fair value on a non-recurring basis | 0 | 0 |
Real Estate Owned [Member] |  |  |
Assets Measured on Non-Recurring Basis [Abstract] |  |  |
Assets, fair value | 0 | 833 |
Losses recognized on assets measured at fair value on a non-recurring basis | $ 0 | $ 45 |

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