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Summary of Significant Accounting Policies, Out of Period Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
Out of Period Adjustments [Abstract] |  |
Prior period adjustments | $ 8 | $ 8

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

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
Name: | us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration