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Summary of Significant Accounting Policies, Loans Receivable Held for Investment (Details) | 12 Months Ended
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Dec. 31, 2020
Loans Receivable Held for Investment [Abstract] |
Delinquency period for interest income to be discontinued on loans | 90 days

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- Definition Period of interest income on loans to be discontinued, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | byfc_FinancingReceivableDelinquencyPeriodForInterestIncomeOnLoansToBeDiscontinued
Namespace Prefix: | byfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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