<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>566</ContextCount>
  <ElementCount>520</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>105</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofIncome</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofComprehensiveIncomeParenthetical</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Changes in Shareholders??? Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofChangesinShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders??? Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - Nature of Business Activities and Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPolicies</Role>
      <ShortName>Nature of Business Activities and Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/Securities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Loans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/Loans</Role>
      <ShortName>Loans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Allowance for Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLosses</Role>
      <ShortName>Allowance for Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/Deposits</Role>
      <ShortName>Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Borrowed Funds</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/BorrowedFunds</Role>
      <ShortName>Borrowed Funds</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Leased Property</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedProperty</Role>
      <ShortName>Leased Property</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Regulatory Capital Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/RegulatoryCapitalMatters</Role>
      <ShortName>Regulatory Capital Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/Derivatives</Role>
      <ShortName>Derivatives</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Accumulated Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLoss</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Other Operating Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/OtherOperatingExpense</Role>
      <ShortName>Other Operating Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensation</Role>
      <ShortName>Share-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - Goodwill and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssets</Role>
      <ShortName>Goodwill and Other Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Nature of Business Activities and Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Nature of Business Activities and Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/Securities</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Loans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LoansTables</Role>
      <ShortName>Loans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/Loans</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Allowance for Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesTables</Role>
      <ShortName>Allowance for Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/AllowanceforCreditLosses</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DepositsTables</Role>
      <ShortName>Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/Deposits</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Borrowed Funds (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/BorrowedFundsTables</Role>
      <ShortName>Borrowed Funds (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/BorrowedFunds</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Leased Property (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyTables</Role>
      <ShortName>Leased Property (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/LeasedProperty</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Regulatory Capital Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/RegulatoryCapitalMattersTables</Role>
      <ShortName>Regulatory Capital Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/RegulatoryCapitalMatters</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - Derivatives (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DerivativesTables</Role>
      <ShortName>Derivatives (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/Derivatives</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/CommitmentsandContingencies</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/FairValueMeasurements</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLoss</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Other Operating Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/OtherOperatingExpenseTables</Role>
      <ShortName>Other Operating Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/OtherOperatingExpense</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationTables</Role>
      <ShortName>Share-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/ShareBasedCompensation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/EarningsPerShare</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Goodwill and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Other Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssets</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Nature of Business Activities and Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPoliciesDetails</Role>
      <ShortName>Nature of Business Activities and Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Securities - Schedule of Debt Securities, Available-for-Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleDetails</Role>
      <ShortName>Securities - Schedule of Debt Securities, Available-for-Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Securities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesNarrativeDetails</Role>
      <ShortName>Securities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - Securities - Schedule of Realized Gain (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesScheduleofRealizedGainLossDetails</Role>
      <ShortName>Securities - Schedule of Realized Gain (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Securities - Schedule of Expected Maturity for Debt Securities, Available-for-Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesScheduleofExpectedMaturityforDebtSecuritiesAvailableforSaleDetails</Role>
      <ShortName>Securities - Schedule of Expected Maturity for Debt Securities, Available-for-Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleUnrealizedLossPositionFairValueDetails</Role>
      <ShortName>Securities - Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Loans - Schedule of Accounts, Notes, Loans and Financing Receivable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LoansScheduleofAccountsNotesLoansandFinancingReceivableDetails</Role>
      <ShortName>Loans - Schedule of Accounts, Notes, Loans and Financing Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Loans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LoansNarrativeDetails</Role>
      <ShortName>Loans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Allowance for Credit Losses - Schedule of Activity in the Allowance for Loan Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofActivityintheAllowanceforLoanCreditLossesDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Activity in the Allowance for Loan Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Allowance for Credit Losses - Schedule of Aging and Non-Accrual Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofAgingandNonAccrualLoansDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Aging and Non-Accrual Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Allowance for Credit Losses - Schedule of Loans by Credit Quality Indicators (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofLoansbyCreditQualityIndicatorsDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Loans by Credit Quality Indicators (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Allowance for Credit Losses - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesNarrativeDetails</Role>
      <ShortName>Allowance for Credit Losses - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Allowance for Credit Losses - Schedule of Collateral Dependent Loans Individually Evaluated (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofCollateralDependentLoansIndividuallyEvaluatedDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Collateral Dependent Loans Individually Evaluated (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Allowance for Credit Losses - Schedule of Purchased Credit Deteriorated Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofPurchasedCreditDeterioratedLoansDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Purchased Credit Deteriorated Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Allowance for Credit Losses - Schedule of Real Estate Owned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofRealEstateOwnedDetails</Role>
      <ShortName>Allowance for Credit Losses - Schedule of Real Estate Owned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Deposits - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DepositsNarrativeDetails</Role>
      <ShortName>Deposits - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Deposits - Schedule of Time Deposit Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DepositsScheduleofTimeDepositMaturitiesDetails</Role>
      <ShortName>Deposits - Schedule of Time Deposit Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Borrowed Funds - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/BorrowedFundsNarrativeDetails</Role>
      <ShortName>Borrowed Funds - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Borrowed Funds - Schedule of Contractual Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/BorrowedFundsScheduleofContractualMaturitiesDetails</Role>
      <ShortName>Borrowed Funds - Schedule of Contractual Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Borrowed Funds - Schedule of Remaining Maturities of Subordinated Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/BorrowedFundsScheduleofRemainingMaturitiesofSubordinatedDebenturesDetails</Role>
      <ShortName>Borrowed Funds - Schedule of Remaining Maturities of Subordinated Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Leased Property - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyNarrativeDetails</Role>
      <ShortName>Leased Property - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Leased Property - Schedule of Lease Income Included in Non-Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofLeaseIncomeIncludedinNonInterestExpenseDetails</Role>
      <ShortName>Leased Property - Schedule of Lease Income Included in Non-Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Leased Property - Schedule of Remaining Maturities of Operating Lease Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofRemainingMaturitiesofOperatingLeaseReceivablesDetails</Role>
      <ShortName>Leased Property - Schedule of Remaining Maturities of Operating Lease Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Leased Property - Schedule of Right-of-Use Assets and Liabilities by Lease Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofRightofUseAssetsandLiabilitiesbyLeaseTypeDetails</Role>
      <ShortName>Leased Property - Schedule of Right-of-Use Assets and Liabilities by Lease Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Leased Property - Schedule of Lease, Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofLeaseCostDetails</Role>
      <ShortName>Leased Property - Schedule of Lease, Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Leased Property - Schedule of Lessee, Operating Lease and Financing Lease, Payment to be Received, Fiscal Year Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofLesseeOperatingLeaseandFinancingLeasePaymenttobeReceivedFiscalYearMaturityDetails</Role>
      <ShortName>Leased Property - Schedule of Lessee, Operating Lease and Financing Lease, Payment to be Received, Fiscal Year Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Leased Property - Schedule of Additional Information on Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/LeasedPropertyScheduleofAdditionalInformationonLeasesDetails</Role>
      <ShortName>Leased Property - Schedule of Additional Information on Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Regulatory Capital Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/RegulatoryCapitalMattersScheduleofActualandRequiredCapitalAmountsandRatiosDetails</Role>
      <ShortName>Regulatory Capital Matters - Schedule of Actual and Required Capital Amounts and Ratios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Regulatory Capital Matters - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/RegulatoryCapitalMattersNarrativeDetails</Role>
      <ShortName>Regulatory Capital Matters - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Derivatives - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DerivativesNarrativeDetails</Role>
      <ShortName>Derivatives - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsinStatementofFinancialPositionFairValueDetails</Role>
      <ShortName>Derivatives - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Derivatives - Schedule of Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DerivativesScheduleofAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Derivatives - Schedule of Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Derivatives - Schedule of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsDetails</Role>
      <ShortName>Derivatives - Schedule of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Commitments and Contingencies - Schedule of Contractual Amounts of Company???s Financial Instruments Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesScheduleofContractualAmountsofCompanysFinancialInstrumentsOutstandingDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Contractual Amounts of Company???s Financial Instruments Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - Commitments and Contingencies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesNarrativeDetails</Role>
      <ShortName>Commitments and Contingencies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Recurring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesRecurringDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Recurring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Nonrecurring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesNonrecurringDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Nonrecurring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueMeasurementInputsandValuationTechniquesDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - Fair Value Measurements - Schedule of Fair Value Disclosure of Asset and Liability not Measured at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueDisclosureofAssetandLiabilitynotMeasuredatFairValueDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value Disclosure of Asset and Liability not Measured at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationoutofAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - Other Operating Expense - Schedule of Other Operating Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/OtherOperatingExpenseScheduleofOtherOperatingExpenseDetails</Role>
      <ShortName>Other Operating Expense - Schedule of Other Operating Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - Other Operating Expense - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/OtherOperatingExpenseNarrativeDetails</Role>
      <ShortName>Other Operating Expense - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - Share-Based Compensation - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationNarrativeDetails</Role>
      <ShortName>Share-Based Compensation - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - Share-Based Compensation - Schedule of Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentArrangementRestrictedStockandRestrictedStockUnitActivityDetails</Role>
      <ShortName>Share-Based Compensation - Schedule of Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - Share-Based Compensation - Schedule of Employee Stock Purchase Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofEmployeeStockPurchasePlanDetails</Role>
      <ShortName>Share-Based Compensation - Schedule of Employee Stock Purchase Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - Share-Based Compensation - Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsDetails</Role>
      <ShortName>Share-Based Compensation - Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - Share-Based Compensation - Schedule of Stock Appreciation Rights and Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofStockAppreciationRightsandOptionActivityDetails</Role>
      <ShortName>Share-Based Compensation - Schedule of Stock Appreciation Rights and Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/EarningsPerShareScheduleofEarningsPerShareBasicandDilutedDetails</Role>
      <ShortName>Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - Earnings Per Share - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/EarningsPerShareNarrativeDetails</Role>
      <ShortName>Earnings Per Share - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Schedule of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - Goodwill and Other Intangible Assets - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="bhrb-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.burkeandherbertbank.com/role/SegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.burkeandherbertbank.com/role/SegmentInformation</ParentRole>
      <Position>97</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="bhrb-20260331.htm">bhrb-20260331.htm</File>
    <File>bhrb-20260331.xsd</File>
    <File>bhrb-20260331_cal.xml</File>
    <File>bhrb-20260331_def.xml</File>
    <File>bhrb-20260331_lab.xml</File>
    <File>bhrb-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2378">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
