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v3.20.1

Loan Commitments and Other Related Activities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($)
Commitments to make loans |  |
Loan commitments and other related activities |  |
Contractual amounts of financial instruments - variable rate | $ 5,930 | $ 10,875
Commitments to make loans | Maximum |  |
Loan commitments and other related activities |  |
Period for which loan commitments are made | 60 days |
Commitments to make loans | Multi-family |  |
Loan commitments and other related activities |  |
Number of loan commitments | loan | 2 |
Period for which initial interest rate is applicable | 5 years |
Commitments to make loans | Multi-family | Minimum |  |
Loan commitments and other related activities |  |
Initial interest rate (as a percent) | 3.50% |
Commitments to make loans | Multi-family | Maximum |  |
Loan commitments and other related activities |  |
Initial interest rate (as a percent) | 3.75% |
Unused lines of credit |  |
Loan commitments and other related activities |  |
Contractual amounts of financial instruments - variable rate | $ 1,970 | $ 1,491

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- Definition Represents the period for which the entity makes commitments to make loans. + References No definition available. + Details
Name: | byfc_CommitmentsToMakeLoansPeriods
Namespace Prefix: | byfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the initial period for which the specified interest rate is applicable under commitments to make loans. + References No definition available. + Details
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Namespace Prefix: | byfc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of loan commitments as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | byfc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the initial interest rate related to a commitment to make a loan. + References No definition available. + Details
Name: | byfc_LoansInterestRateStatedPercentage
Namespace Prefix: | byfc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61082-112788 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |