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Loans Receivable Held for Sale (Q3) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Loans Receivable Held for Sale [Abstract] |  |  |
Gross loans receivable before deferred loan origination costs | $ 40,503 | $ 0 |
Net deferred loan origination costs | 150 | 0 |
Loans receivable held for sale, net | $ 40,653 | $ 0 | $ 6,231

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- Definition Amount before allowance for loans and leases and deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. + References No definition available. + Details
Name: | byfc_LoansReceivableHeldForSaleAmountBeforeDeferredLoanOriginationCosts
Namespace Prefix: | byfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of net deferred loan origination costs related to loans receivable held for sale. + References No definition available. + Details
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Namespace Prefix: | byfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesHeldForSaleAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration