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Subsequent Events (Details) $ in Millions | Feb. 21, 2018 USD ($)
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Multi-family |
Subsequent Events |
Amount of loans held for sale reclassified to loans held for investment | $ 16.9

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- Definition The amount of loans held for sale reclassified to loans held for investment. + References No definition available. + Details
Name: | byfc_ReclassificationAdjustmentOfLoansHeldForSaleToLoansHeldForInvestment
Namespace Prefix: | byfc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |