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v3.21.1

Summary of Significant Accounting Policies, Office Properties and Equipment (Details) | 12 Months Ended
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Dec. 31, 2020
Office Buildings and Improvements [Member] | Minimum [Member] |
Office Properties and Equipment [Abstract] |
Useful life | 10 years
Office Buildings and Improvements [Member] | Maximum [Member] |
Office Properties and Equipment [Abstract] |
Useful life | 40 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |
Office Properties and Equipment [Abstract] |
Useful life | 3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |
Office Properties and Equipment [Abstract] |
Useful life | 10 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=byfc_FurnitureFixtureAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |