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Regulatory Matters (Q3) (Details) $ in Thousands | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015
--- | --- | --- | --- | ---
Actual [Abstract] |  |  |  |
Tier 1 (Leverage), Amount | $ 47,779 | $ 48,541 | $ 49,433 |
Tier 1 (Leverage), Ratio | 0.0984 | 0.1156 | 0.1203 |
Common Equity Tier 1, Amount | $ 47,779 | $ 48,541 | $ 49,433 |
Common Equity Tier 1, Ratio | 0.1694 | 0.1714 | 0.1932 |
Tier 1, Amount | $ 47,779 | $ 48,541 | $ 49,433 |
Tier 1, Ratio | 0.1694 | 0.1714 | 0.1932 |
Total Capital, Amount | $ 51,053 | $ 51,790 | $ 52,417 |
Total Capital, Ratio | 0.1810 | 0.1829 | 0.2048 |
Minimum Capital Requirements [Abstract] |  |  |  |
Tier 1 (Leverage), Amount | $ 19,429 | $ 16,798 | $ 16,439 |
Tier 1 (leverage), Ratio | 0.0400 | 0.0400 | 0.0400 |
Common Equity Tier 1, Amount | $ 12,693 | $ 12,743 | $ 18,494 |
Common Equity Tier 1, Ratio | 0.0450 | 0.0450 | 0.0450 |
Tier 1, Amount | $ 16,924 | $ 16,990 | $ 24,659 |
Tier 1, Ratio | 0.0600 | 0.0600 | 0.0600 |
Total Capital, Amount | $ 22,565 | $ 22,654 | $ 32,879 |
Total Capital, Ratio | 0.0800 | 0.0800 | 0.0800 |
Minimum Required To Be Well Capitalized Under Prompt Corrective Action Provisions [Abstract] |  |  |  |
Tier 1 (Leverage), Amount | $ 24,286 | $ 20,997 | $ 20,549 |
Tier 1 (Leverage), Ratio | 0.0500 | 0.0500 | 0.0500 |
Common Equity Tier 1, Amount | $ 18,334 | $ 18,406 | $ 16,634 |
Common Equity Tier 1, Ratio | 0.0650 | 0.0650 | 0.0650 |
Tier 1, Amount | $ 22,565 | $ 22,654 | $ 20,472 |
Tier 1, Ratio | 0.0800 | 0.0800 | 0.0800 |
Total Capital, Amount | $ 28,206 | $ 28,318 | $ 25,590 |
Total Capital, Ratio | 0.1000 | 0.1000 | 0.1000 |
Conservation Buffer Rule Starting January 1, 2016 [Member] |  |  |  |
Regulatory Matters [Abstract] |  |  |  |
Capital conservation buffer percentage |  |  |  | 0.625%
Conservation Buffer Rule Subsequent to 2016 [Member] |  |  |  |
Regulatory Matters [Abstract] |  |  |  |
Capital conservation buffer annual increase percentage |  |  |  | 0.625%
Conservation Buffer Rule [Member] |  |  |  |
Regulatory Matters [Abstract] |  |  |  |
Capital conservation buffer percentage |  |  | 2.50% |

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