    <SEC-DOCUMENT>0001046025-25-000106-index.html : 20250506
    <SEC-HEADER>0001046025-25-000106.hdr.sgml : 20250506
    <ACCEPTANCE-DATETIME>20250506135959
    ACCESSION NUMBER:		0001046025-25-000106
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		49
    CONFORMED PERIOD OF REPORT:	20250505
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Submission of Matters to a Vote of Security Holders
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20250506
    DATE AS OF CHANGE:		20250506

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			HERITAGE FINANCIAL CORP /WA/
    		CENTRAL INDEX KEY:			0001046025
    		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
    		ORGANIZATION NAME:           	02 Finance
    		EIN:				911857900
    		STATE OF INCORPORATION:			WA
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-29480
    		FILM NUMBER:		25916554

    	BUSINESS ADDRESS:
    		STREET 1:		201 FIFTH AVENUE S.W.
    		STREET 2:		P O BOX 1578
    		CITY:			OLYMPIA
    		STATE:			WA
    		ZIP:			98501
    		BUSINESS PHONE:		3609431500

    	MAIL ADDRESS:
    		STREET 1:		205 5TH AVE SW
    		STREET 2:		P O BOX 1578
    		CITY:			OLYMPIA
    		STATE:			WA
    		ZIP:			98501
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>hfwa-20250505.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: hfwa-20250505.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>exhibit101-employmentagr.htm
    <DESCRIPTION>EX-10.1
    <TEXT>
    Document 2 - file: exhibit101-employmentagr.htm

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    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>3
    <FILENAME>ex991pressreleaseofheritag.htm
    <DESCRIPTION>EX-99.1
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    Document 3 - file: ex991pressreleaseofheritag.htm

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    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>hfwa-20250505.xsd
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    <SEQUENCE>8
    <FILENAME>exhibit101-employmentagr001.jpg
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    Document 8 - file: exhibit101-employmentagr001.jpg

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    <FILENAME>exhibit101-employmentagr002.jpg
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    Document 9 - file: exhibit101-employmentagr002.jpg

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    <SEQUENCE>10
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    Document 10 - file: exhibit101-employmentagr003.jpg

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    Document 11 - file: exhibit101-employmentagr004.jpg

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    Document 12 - file: exhibit101-employmentagr005.jpg

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    Document 13 - file: exhibit101-employmentagr006.jpg

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    Document 14 - file: exhibit101-employmentagr007.jpg

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    Document 15 - file: exhibit101-employmentagr008.jpg

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    Document 16 - file: exhibit101-employmentagr009.jpg

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    Document 17 - file: exhibit101-employmentagr010.jpg

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    <SEQUENCE>18
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    <SEQUENCE>19
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    Document 19 - file: exhibit101-employmentagr012.jpg

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    <SEQUENCE>20
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    Document 20 - file: exhibit101-employmentagr013.jpg

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    Document 21 - file: exhibit101-employmentagr014.jpg

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    <SEQUENCE>22
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    Document 22 - file: exhibit101-employmentagr015.jpg

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    Document 23 - file: exhibit101-employmentagr016.jpg

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    Document 24 - file: exhibit101-employmentagr017.jpg

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    Document 25 - file: exhibit101-employmentagr018.jpg

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    Document 26 - file: exhibit101-employmentagr019.jpg

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    <SEQUENCE>27
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    Document 27 - file: exhibit101-employmentagr020.jpg

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    Document 28 - file: exhibit101-employmentagr021.jpg

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    <SEQUENCE>29
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    Document 29 - file: exhibit101-employmentagr022.jpg

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    <SEQUENCE>30
    <FILENAME>exhibit101-employmentagr023.jpg
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    Document 30 - file: exhibit101-employmentagr023.jpg

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    <DOCUMENT>
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    <SEQUENCE>31
    <FILENAME>exhibit101-employmentagr024.jpg
    <TEXT>
    Document 31 - file: exhibit101-employmentagr024.jpg

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    <SEQUENCE>32
    <FILENAME>exhibit101-employmentagr025.jpg
    <TEXT>
    Document 32 - file: exhibit101-employmentagr025.jpg

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    <SEQUENCE>33
    <FILENAME>exhibit101-employmentagr026.jpg
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    Document 33 - file: exhibit101-employmentagr026.jpg

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    <SEQUENCE>34
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    Document 34 - file: exhibit101-employmentagr027.jpg

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    <SEQUENCE>35
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    Document 35 - file: exhibit101-employmentagr028.jpg

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    <SEQUENCE>36
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    Document 36 - file: exhibit101-employmentagr029.jpg

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    Document 37 - file: exhibit101-employmentagr030.jpg

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    Document 38 - file: exhibit101-employmentagr031.jpg

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    Document 39 - file: exhibit101-employmentagr032.jpg

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    <SEQUENCE>40
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    Document 40 - file: image_0.jpg

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    Document 43 - file: Financial_Report.xlsx

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