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Income Taxes, Effective Income Tax Rate Reconciliation (FY) (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
Reconciliation of Provision of Income Taxes [Abstract] |  |  |  |  |  |
Federal statutory rate |  |  | 21.00% |  | 21.00% |
Federal statutory rate times financial statement net (loss) income |  |  |  |  | $ (115) | $ 183
Effect of [Abstract] |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  | (45) | 77
Change in federal rate |  |  |  |  | 0 | 0
Earnings from bank owned life insurance |  |  |  |  | (11) | (16)
Low income housing credits |  |  |  |  | (198) | (212)
Change in valuation allowance |  |  |  |  | 0 | 0
Other, net |  |  |  |  | 24 | 24
Total | $ 95 | $ (176) | $ (300) | $ (262) | $ (345) | $ 56

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