Concentration of Credit Risk (Q3) (Details) - Deposits [Member] - Customer Concentration Risk [Member] - Customer	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Concentration Percentage [Abstract]
Number of significant customers	2
Two Customers [Member]
Concentration Percentage [Abstract]
Percentage of concentration risk	13.00%
Customer One [Member]
Concentration Percentage [Abstract]
Percentage of concentration risk	8.00%	10.00%
Customer One [Member] \| Minimum [Member]
Concentration Percentage [Abstract]
Customer relationship period	15 years

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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