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Summary of Significant Accounting Policies, Loans Receivable Held for Investment (Details)	12 Months Ended
	Dec. 31, 2024
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