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Summary of Significant Accounting Policies - Loans Receivable Held for Investment (Details) | 12 Months Ended
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Dec. 31, 2017
Summary of Significant Accounting Policies |
Delinquency period for interest income to be discontinued on loans | 90 days

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- Definition Represents the delinquency period for interest income on loans to be discontinued. + 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_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration