<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>610</ContextCount>
  <ElementCount>335</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>84</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000100 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010000 - Statement - Consolidated Statements of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfFinancialCondition</Role>
      <ShortName>Consolidated Statements of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010100 - Statement - Consolidated Statements of Financial Condition (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical</Role>
      <ShortName>Consolidated Statements of Financial Condition (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>020000 - Statement - Consolidated Statements of Operations and Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>020100 - Statement - Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncomeLossParenthetical</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>030000 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>040000 - Statement - Consolidated Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConsolidatedStatementsOfChangesInStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>060100 - Disclosure - Basis of Financial Statement Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/BasisOfFinancialStatementPresentation</Role>
      <ShortName>Basis of Financial Statement Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>060200 - Disclosure - Earnings Per Share of Common Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EarningsPerShareOfCommonStock</Role>
      <ShortName>Earnings Per Share of Common Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>060300 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/Securities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>060400 - Disclosure - Loans Receivable Held for Investment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestment</Role>
      <ShortName>Loans Receivable Held for Investment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>060500 - Disclosure - Goodwill and Core Deposit Intangible</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangible</Role>
      <ShortName>Goodwill and Core Deposit Intangible</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>060600 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/Borrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>060700 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/FairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>060800 - Disclosure - Stock-based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/StockbasedCompensation</Role>
      <ShortName>Stock-based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>060900 - Disclosure - ESOP Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EsopPlan</Role>
      <ShortName>ESOP Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>061000 - Disclosure - Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/RegulatoryMatters</Role>
      <ShortName>Regulatory Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>061100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>061200 - Disclosure - Concentrations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/Concentrations</Role>
      <ShortName>Concentrations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>061300 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>070100 - Disclosure - Basis of Financial Statement Presentation (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/BasisOfFinancialStatementPresentationPolicies</Role>
      <ShortName>Basis of Financial Statement Presentation (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>080200 - Disclosure - Earnings Per Share of Common Stock (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EarningsPerShareOfCommonStockTables</Role>
      <ShortName>Earnings Per Share of Common Stock (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/EarningsPerShareOfCommonStock</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>080300 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/SecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/Securities</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>080400 - Disclosure - Loans Receivable Held for Investment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentTables</Role>
      <ShortName>Loans Receivable Held for Investment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/LoansReceivableHeldForInvestment</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>080500 - Disclosure - Goodwill and Core Deposit Intangible (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangibleTables</Role>
      <ShortName>Goodwill and Core Deposit Intangible (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangible</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>080700 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/FairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/FairValue</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>080800 - Disclosure - Stock-based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/StockbasedCompensationTables</Role>
      <ShortName>Stock-based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/StockbasedCompensation</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>080900 - Disclosure - ESOP Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EsopPlanTables</Role>
      <ShortName>ESOP Plan (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/EsopPlan</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>081000 - Disclosure - Regulatory Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/RegulatoryMattersTables</Role>
      <ShortName>Regulatory Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/RegulatoryMatters</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>090100 - Disclosure - Basis of Financial Statement Presentation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/BasisOfFinancialStatementPresentationDetails</Role>
      <ShortName>Basis of Financial Statement Presentation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/BasisOfFinancialStatementPresentationPolicies</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>090200 - Disclosure - Earnings Per Share of Common Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EarningsPerShareOfCommonStockDetails</Role>
      <ShortName>Earnings Per Share of Common Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/EarningsPerShareOfCommonStockTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>090300 - Disclosure - Securities, Available-for-Sale Investment Securities Portfolios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/SecuritiesAvailableforsaleInvestmentSecuritiesPortfoliosDetails</Role>
      <ShortName>Securities, Available-for-Sale Investment Securities Portfolios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>090302 - Disclosure - Securities, Additional Disclosure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/SecuritiesAdditionalDisclosureDetails</Role>
      <ShortName>Securities, Additional Disclosure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>090304 - Disclosure - Securities, Contractual Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/SecuritiesContractualMaturitiesDetails</Role>
      <ShortName>Securities, Contractual Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>090306 - Disclosure - Securities, Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/SecuritiesUnrealizedLossPositionDetails</Role>
      <ShortName>Securities, Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>090400 - Disclosure - Loans Receivable Held for Investment, Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentSummaryDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>090402 - Disclosure - Loans Receivable Held for Investment, Activity in Allowance for Credit Losses on Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentActivityInAllowanceForCreditLossesOnLoansDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Activity in Allowance for Credit Losses on Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>090404 - Disclosure - Loans Receivable Held for Investment, Collateral Dependent Loans by Collateral Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentCollateralDependentLoansByCollateralTypeDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Collateral Dependent Loans by Collateral Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>090406 - Disclosure - Loans Receivable Held for Investment, Aging of Recorded Investment in Past Due Loans by Loan Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentAgingOfRecordedInvestmentInPastDueLoansByLoanTypeDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Aging of Recorded Investment in Past Due Loans by Loan Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>090408 - Disclosure - Loans Receivable Held for Investment, Recorded Investment in Non-accrual Loans by Loan Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentRecordedInvestmentInNonaccrualLoansByLoanTypeDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Recorded Investment in Non-accrual Loans by Loan Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>090410 - Disclosure - Loans Receivable Held for Investment, Internal Risk Grading and by Year of Origination (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentInternalRiskGradingAndByYearOfOriginationDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Internal Risk Grading and by Year of Origination (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>090412 - Disclosure - Loans Receivable Held for Investment, Off-Balance Sheet Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/LoansReceivableHeldForInvestmentOffbalanceSheetCommitmentsDetails</Role>
      <ShortName>Loans Receivable Held for Investment, Off-Balance Sheet Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>090500 - Disclosure - Goodwill and Core Deposit Intangible, Changes in Carrying Amounts of Goodwill and Core Deposit Intangibles (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangibleChangesInCarryingAmountsOfGoodwillAndCoreDepositIntangiblesDetails</Role>
      <ShortName>Goodwill and Core Deposit Intangible, Changes in Carrying Amounts of Goodwill and Core Deposit Intangibles (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>090502 - Disclosure - Goodwill and Core Deposit Intangible, Components of Carrying Amount of Core Deposit Intangible (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangibleComponentsOfCarryingAmountOfCoreDepositIntangibleDetails</Role>
      <ShortName>Goodwill and Core Deposit Intangible, Components of Carrying Amount of Core Deposit Intangible (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>090504 - Disclosure - Goodwill and Core Deposit Intangible, Estimated Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/GoodwillAndCoreDepositIntangibleEstimatedAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Core Deposit Intangible, Estimated Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>090600 - Disclosure - Borrowings, Liabilities Securities Sold under Agreements to Repurchase (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/BorrowingsLiabilitiesSecuritiesSoldUnderAgreementsToRepurchaseDetails</Role>
      <ShortName>Borrowings, Liabilities Securities Sold under Agreements to Repurchase (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>090602 - Disclosure - Borrowings, Other Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/BorrowingsOtherBorrowingsDetails</Role>
      <ShortName>Borrowings, Other Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>090700 - Disclosure - Fair Value, Assets Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/FairValueAssetsMeasuredOnRecurringBasisDetails</Role>
      <ShortName>Fair Value, Assets Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>090702 - Disclosure - Fair Value, Assets Measured on Non-Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/FairValueAssetsMeasuredOnNonrecurringBasisDetails</Role>
      <ShortName>Fair Value, Assets Measured on Non-Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>090704 - Disclosure - Fair Value, Fair Values of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/FairValueFairValuesOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value, Fair Values of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>090800 - Disclosure - Stock-based Compensation, Long-Term Incentive Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/StockbasedCompensationLongtermIncentivePlanDetails</Role>
      <ShortName>Stock-based Compensation, Long-Term Incentive Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>090802 - Disclosure - Stock-based Compensation, Stock Award Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/StockbasedCompensationStockAwardActivityDetails</Role>
      <ShortName>Stock-based Compensation, Stock Award Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>090804 - Disclosure - Stock-based Compensation, Options Outstanding and Exercisable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/StockbasedCompensationOptionsOutstandingAndExercisableDetails</Role>
      <ShortName>Stock-based Compensation, Options Outstanding and Exercisable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>090900 - Disclosure - ESOP Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/EsopPlanDetails</Role>
      <ShortName>ESOP Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/EsopPlanTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>091000 - Disclosure - Regulatory Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/RegulatoryMattersDetails</Role>
      <ShortName>Regulatory Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/RegulatoryMattersTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>091100 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/IncomeTaxes</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ef20034539_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>091200 - Disclosure - Concentrations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://broadwayfed.com/role/ConcentrationsDetails</Role>
      <ShortName>Concentrations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://broadwayfed.com/role/Concentrations</ParentRole>
      <Position>57</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>byfc-20240930.xsd</File>
    <File>byfc-20240930_cal.xml</File>
    <File>byfc-20240930_def.xml</File>
    <File>byfc-20240930_lab.xml</File>
    <File>byfc-20240930_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="ef20034539_10q.htm">ef20034539_10q.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2071">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="31">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
