    <SEC-DOCUMENT>0001046025-22-000138-index.html : 20220928
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    <ACCEPTANCE-DATETIME>20220928110206
    ACCESSION NUMBER:		0001046025-22-000138
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		17
    CONFORMED PERIOD OF REPORT:	20220926
    ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20220928
    DATE AS OF CHANGE:		20220928

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			HERITAGE FINANCIAL CORP /WA/
    		CENTRAL INDEX KEY:			0001046025
    		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
    		IRS NUMBER:				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:		221273454

    	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-20220926.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: hfwa-20220926.htm

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    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>form8-k_hirmanretirement.htm
    <DESCRIPTION>EX-10.1
    <TEXT>
    Document 2 - file: form8-k_hirmanretirement.htm

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>3
    <FILENAME>hfwa-20220926.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 3 - file: hfwa-20220926.xsd

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    <FILENAME>hfwa-20220926_def.xml
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    <FILENAME>hfwa-20220926_lab.xml
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    <FILENAME>hfwa-20220926_pre.xml
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    <TEXT>
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    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>form8-k_hirmanretirement001.jpg
    <TEXT>
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    <FILENAME>form8-k_hirmanretirement003.jpg
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    <SEQUENCE>10
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
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    <DOCUMENT>
    <TYPE>XML
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    <FILENAME>hfwa-20220926_htm.xml
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    <TEXT>
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    Document 11 - RAW XML: hfwa-20220926_htm.xml

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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>12
    <FILENAME>Financial_Report.xlsx
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    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>13
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    <TEXT>
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    <SEQUENCE>14
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    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>FilingSummary.xml
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    <TYPE>JSON
    <SEQUENCE>17
    <FILENAME>MetaLinks.json
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    <TEXT>
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    <TYPE>ZIP
    <SEQUENCE>18
    <FILENAME>0001046025-22-000138-xbrl.zip
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