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Capital and Regulatory Matters (FY) (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 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%