<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>649</ContextCount>
  <ElementCount>608</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>104</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - Condensed Consolidated Statements of Financial Condition (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CondensedConsolidatedStatementsofFinancialConditionUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Financial Condition (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CondensedConsolidatedStatementsofFinancialConditionUnauditedParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - Condensed Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CondensedConsolidatedStatementsofIncomeUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/ConsolidatedStatementsofComprehensiveIncomeLossUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/ConsolidatedStatementsofComprehensiveIncomeLossParenthetical</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/ConsolidatedStatementsofStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/ConsolidatedStatementsofStockholdersEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DescriptionofBusinessBasisofPresentationSignificantAccountingPoliciesandRecentlyIssuedAccountingPronouncements</Role>
      <ShortName>Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - Investment Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecurities</Role>
      <ShortName>Investment Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - Loans Receivable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivable</Role>
      <ShortName>Loans Receivable</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - Allowance for Credit Losses on Loans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoans</Role>
      <ShortName>Allowance for Credit Losses on Loans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/PremisesandEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - Goodwill and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssets</Role>
      <ShortName>Goodwill and Other Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - Derivative Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DerivativeFinancialInstruments</Role>
      <ShortName>Derivative Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/Deposits</Role>
      <ShortName>Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - Junior Subordinated Debentures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/JuniorSubordinatedDebentures</Role>
      <ShortName>Junior Subordinated Debentures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - Other Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/OtherBorrowings</Role>
      <ShortName>Other Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - Leases Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LeasesLeases</Role>
      <ShortName>Leases Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - Investments in Tax Credits Structures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentsinTaxCreditsStructures</Role>
      <ShortName>Investments in Tax Credits Structures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - Regulatory Capital Requirements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/RegulatoryCapitalRequirements</Role>
      <ShortName>Regulatory Capital Requirements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - Heritage Financial Corporation (Parent Company Only)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnly</Role>
      <ShortName>Heritage Financial Corporation (Parent Company Only)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952180 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9952181 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.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>33</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DescriptionofBusinessBasisofPresentationSignificantAccountingPoliciesandRecentlyIssuedAccountingPronouncementsPolicies</Role>
      <ShortName>Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/DescriptionofBusinessBasisofPresentationSignificantAccountingPoliciesandRecentlyIssuedAccountingPronouncements</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - Investment Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesTables</Role>
      <ShortName>Investment Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/InvestmentSecurities</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - Loans Receivable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableTables</Role>
      <ShortName>Loans Receivable (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/LoansReceivable</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - Allowance for Credit Losses on Loans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoansTables</Role>
      <ShortName>Allowance for Credit Losses on Loans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoans</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - Premises and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/PremisesandEquipmentTables</Role>
      <ShortName>Premises and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/PremisesandEquipment</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - Goodwill and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Other Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssets</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - Derivative Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DerivativeFinancialInstrumentsTables</Role>
      <ShortName>Derivative Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/DerivativeFinancialInstruments</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DepositsTables</Role>
      <ShortName>Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/Deposits</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - Other Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/OtherBorrowingsTables</Role>
      <ShortName>Other Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/OtherBorrowings</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/LeasesLeases</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - Employee Benefit Plans Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/EmployeeBenefitPlansEmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/StockholdersEquity</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/FairValueMeasurements</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/StockBasedCompensation</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/IncomeTaxes</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - Commitment and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CommitmentandContingenciesTables</Role>
      <ShortName>Commitment and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - Regulatory Capital Requirements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/RegulatoryCapitalRequirementsTables</Role>
      <ShortName>Regulatory Capital Requirements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/RegulatoryCapitalRequirements</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - Heritage Financial Corporation (Parent Company Only) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyTables</Role>
      <ShortName>Heritage Financial Corporation (Parent Company Only) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnly</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DescriptionofBusinessBasisofPresentationSignificantAccountingPoliciesandRecentlyIssuedAccountingPronouncementsDetails</Role>
      <ShortName>Description of Business, Basis of Presentation, Significant Accounting Policies and Recently Issued Accounting Pronouncements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/DescriptionofBusinessBasisofPresentationSignificantAccountingPoliciesandRecentlyIssuedAccountingPronouncementsPolicies</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - Investment Securities - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesTextualDetails</Role>
      <ShortName>Investment Securities - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - Investment Securities - Schedule of Amortized, Gross Unrealized Gains and Losses, and Fair Value on Investment Securities, Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesScheduleofAmortizedGrossUnrealizedGainsandLossesandFairValueonInvestmentSecuritiesAvailableforSaleDetails</Role>
      <ShortName>Investment Securities - Schedule of Amortized, Gross Unrealized Gains and Losses, and Fair Value on Investment Securities, Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - Investment Securities - Schedule of Amortized, Gross, Unrecognized Gains and Losses, and Fair Value on Investment Securities, Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesScheduleofAmortizedGrossUnrecognizedGainsandLossesandFairValueonInvestmentSecuritiesHeldtoMaturityDetails</Role>
      <ShortName>Investment Securities - Schedule of Amortized, Gross, Unrecognized Gains and Losses, and Fair Value on Investment Securities, Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - Investment Securities - Schedule of Unrealized Losses on Investment Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesScheduleofUnrealizedLossesonInvestmentSecuritiesAvailableforSaleDetails</Role>
      <ShortName>Investment Securities - Schedule of Unrealized Losses on Investment Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - Investment Securities - Schedule of Realized Gains and Losses on Sale of Investment Securities Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesScheduleofRealizedGainsandLossesonSaleofInvestmentSecuritiesAvailableforSaleDetails</Role>
      <ShortName>Investment Securities - Schedule of Realized Gains and Losses on Sale of Investment Securities Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - Investment Securities - Schedule of Amortized Cost and Fair Value of Investment Securities Pledged as Collateral (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentSecuritiesScheduleofAmortizedCostandFairValueofInvestmentSecuritiesPledgedasCollateralDetails</Role>
      <ShortName>Investment Securities - Schedule of Amortized Cost and Fair Value of Investment Securities Pledged as Collateral (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - Loans Receivable - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableTextualDetails</Role>
      <ShortName>Loans Receivable - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - Loans Receivable - Schedule of Accounts, Notes, Loans and Financing Receivable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableScheduleofAccountsNotesLoansandFinancingReceivableDetails</Role>
      <ShortName>Loans Receivable - Schedule of Accounts, Notes, Loans and Financing Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - Loans Receivable - Schedule of Loans Receivable, Amortized Cost, by Risk Grade, Origination Year and Gross Charge-Offs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableScheduleofLoansReceivableAmortizedCostbyRiskGradeOriginationYearandGrossChargeOffsDetails</Role>
      <ShortName>Loans Receivable - Schedule of Loans Receivable, Amortized Cost, by Risk Grade, Origination Year and Gross Charge-Offs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - Loans Receivable - Summary of Amortized Cost of Nonaccrual Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableSummaryofAmortizedCostofNonaccrualLoansDetails</Role>
      <ShortName>Loans Receivable - Summary of Amortized Cost of Nonaccrual Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - Loans Receivable - Summary of Amortized Cost of Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableSummaryofAmortizedCostofPastDueLoansDetails</Role>
      <ShortName>Loans Receivable - Summary of Amortized Cost of Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - Loans Receivable - Schedule of Collateral Dependent Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableScheduleofCollateralDependentLoansDetails</Role>
      <ShortName>Loans Receivable - Schedule of Collateral Dependent Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - Loans Receivable - Schedule of Loan Modifications (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableScheduleofLoanModificationsDetails</Role>
      <ShortName>Loans Receivable - Schedule of Loan Modifications (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - Loans Receivable - Summary of Related Party Activity Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableSummaryofRelatedPartyActivityLoansDetails</Role>
      <ShortName>Loans Receivable - Summary of Related Party Activity Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - Loans Receivable - Summary of Loans Serviced (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LoansReceivableSummaryofLoansServicedDetails</Role>
      <ShortName>Loans Receivable - Summary of Loans Serviced (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - Allowance for Credit Losses on Loans - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoansTextualDetails</Role>
      <ShortName>Allowance for Credit Losses on Loans - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - Allowance for Credit Losses on Loans - Summary of Changes in Allowance for Credit Losses on Loans Receivable and Unfunded Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoansSummaryofChangesinAllowanceforCreditLossesonLoansReceivableandUnfundedCommitmentsDetails</Role>
      <ShortName>Allowance for Credit Losses on Loans - Summary of Changes in Allowance for Credit Losses on Loans Receivable and Unfunded Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - Allowance for Credit Losses on Loans - Summary of Activity in the ACL on Unfunded Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/AllowanceforCreditLossesonLoansSummaryofActivityintheACLonUnfundedCommitmentsDetails</Role>
      <ShortName>Allowance for Credit Losses on Loans - Summary of Activity in the ACL on Unfunded Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - Premises and Equipment - Schedule of Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/PremisesandEquipmentScheduleofPremisesandEquipmentDetails</Role>
      <ShortName>Premises and Equipment - Schedule of Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - Premises and Equipment - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/PremisesandEquipmentTextualDetails</Role>
      <ShortName>Premises and Equipment - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - Goodwill and Other Intangible Assets - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssetsTextualDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Other Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssetsScheduleofChangesinCarryingValueofOtherIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Other Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Estimated Aggregate Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/GoodwillandOtherIntangibleAssetsScheduleofEstimatedAggregateAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Schedule of Estimated Aggregate Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - Derivative Financial Instruments - Schedule of Interest Rate Derivative Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DerivativeFinancialInstrumentsScheduleofInterestRateDerivativeContractsDetails</Role>
      <ShortName>Derivative Financial Instruments - Schedule of Interest Rate Derivative Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Derivative Financial Instruments - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DerivativeFinancialInstrumentsTextualDetails</Role>
      <ShortName>Derivative Financial Instruments - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - Deposits - Schedule of Deposit Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DepositsScheduleofDepositLiabilitiesDetails</Role>
      <ShortName>Deposits - Schedule of Deposit Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - Deposits - Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DepositsTextualsDetails</Role>
      <ShortName>Deposits - Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - Deposits - Schedule of Time Deposit Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/DepositsScheduleofTimeDepositMaturitiesDetails</Role>
      <ShortName>Deposits - Schedule of Time Deposit Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - Junior Subordinated Debentures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/JuniorSubordinatedDebenturesDetails</Role>
      <ShortName>Junior Subordinated Debentures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/JuniorSubordinatedDebentures</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - Other Borrowings - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/OtherBorrowingsTextualDetails</Role>
      <ShortName>Other Borrowings - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - Leases - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LeasesTextualDetails</Role>
      <ShortName>Leases - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - Leases - Schedule of Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LeasesScheduleofLeaseCostDetails</Role>
      <ShortName>Leases - Schedule of Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - Leases - Schedule of Lease Payment Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/LeasesScheduleofLeasePaymentObligationsDetails</Role>
      <ShortName>Leases - Schedule of Lease Payment Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - Employee Benefit Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/EmployeeBenefitPlansNarrativeDetails</Role>
      <ShortName>Employee Benefit Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - Employee Benefit Plans - Schedule of Defined Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/EmployeeBenefitPlansScheduleofDefinedBenefitPlansDetails</Role>
      <ShortName>Employee Benefit Plans - Schedule of Defined Benefit Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - Stockholders' Equity - Schedule of Earnings per Common Share Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockholdersEquityScheduleofEarningsperCommonShareReconciliationDetails</Role>
      <ShortName>Stockholders' Equity - Schedule of Earnings per Common Share Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - Stockholders' Equity - Schedule of Dividends Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockholdersEquityScheduleofDividendsActivityDetails</Role>
      <ShortName>Stockholders' Equity - Schedule of Dividends Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - Stockholders' Equity - Textual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockholdersEquityTextualDetails</Role>
      <ShortName>Stockholders' Equity - Textual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Measured on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Measured on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets, Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurementsScheduleofFairValueAssetsNonrecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value, Assets, Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - Fair Value Measurements - Schedule of Fair Value Measurements, Non-recurring Basis, Level 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurementsScheduleofFairValueMeasurementsNonrecurringBasisLevel3Details</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value Measurements, Non-recurring Basis, Level 3 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Financial Instruments, Carrying Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/FairValueMeasurementsScheduleofFairValueFinancialInstrumentsCarryingValueDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Fair Value, Financial Instruments, Carrying Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - Stock-Based Compensation - Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockBasedCompensationTextualsDetails</Role>
      <ShortName>Stock-Based Compensation - Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - Stock-Based Compensation - Schedule of Assumptions of PRSUs Granted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockBasedCompensationScheduleofAssumptionsofPRSUsGrantedDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Assumptions of PRSUs Granted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - Stock-Based Compensation - Schedule of Nonvested Share Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/StockBasedCompensationScheduleofNonvestedShareActivityDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Nonvested Share Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - Investments in Tax Credits Structures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/InvestmentsinTaxCreditsStructuresDetails</Role>
      <ShortName>Investments in Tax Credits Structures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/InvestmentsinTaxCreditsStructures</ParentRole>
      <Position>100</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - Income Taxes (Details)-Income before Income Tax</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesDetailsIncomebeforeIncomeTax</Role>
      <ShortName>Income Taxes (Details)-Income before Income Tax</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/IncomeTaxesTables</ParentRole>
      <Position>101</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesScheduleofIncomeTaxExpenseDetails</Role>
      <ShortName>Income Taxes - Schedule of Income Tax Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - Income Taxes - Textuals (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesTextualsDetails</Role>
      <ShortName>Income Taxes - Textuals (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesScheduleofReconciliationofEffectiveIncomeTaxRateDetails</Role>
      <ShortName>Income Taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - Income Taxes - Schedule of Components of Deferred Income Tax Asset (Liability) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesScheduleofComponentsofDeferredIncomeTaxAssetLiabilityDetails</Role>
      <ShortName>Income Taxes - Schedule of Components of Deferred Income Tax Asset (Liability) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/IncomeTaxesPaidDetails</Role>
      <ShortName>Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - Commitments and Contingencies - Schedule of Outstanding Commitments to Extend Credit, Off-Balance-Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/CommitmentsandContingenciesScheduleofOutstandingCommitmentstoExtendCreditOffBalanceSheetDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Outstanding Commitments to Extend Credit, Off-Balance-Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - Regulatory Capital Requirements - Schedule of Capital Ratios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/RegulatoryCapitalRequirementsScheduleofCapitalRatiosDetails</Role>
      <ShortName>Regulatory Capital Requirements - Schedule of Capital Ratios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Financial Condition, Parent Company Only (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyScheduleofCondensedStatementsofFinancialConditionParentCompanyOnlyDetails</Role>
      <ShortName>Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Financial Condition, Parent Company Only (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyTables</ParentRole>
      <Position>109</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Income, Parent Company Only (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyScheduleofCondensedStatementsofIncomeParentCompanyOnlyDetails</Role>
      <ShortName>Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Income, Parent Company Only (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyTables</ParentRole>
      <Position>110</Position>
    </Report>
    <Report instance="hfwa-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Cash Flows, Parent Company Only (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyScheduleofCondensedStatementsofCashFlowsParentCompanyOnlyDetails</Role>
      <ShortName>Heritage Financial Corporation (Parent Company Only) - Schedule of Condensed Statements of Cash Flows, Parent Company Only (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hf-wa.com/role/HeritageFinancialCorporationParentCompanyOnlyTables</ParentRole>
      <Position>111</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-K" isDefinitelyFs="true" isUsgaap="true" original="hfwa-20251231.htm">hfwa-20251231.htm</File>
    <File>hfwa-20251231.xsd</File>
    <File>hfwa-20251231_cal.xml</File>
    <File>hfwa-20251231_def.xml</File>
    <File>hfwa-20251231_lab.xml</File>
    <File>hfwa-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>hfwa-20251231_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="5">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="2875">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="16">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
