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Dec. 21, 2020
Dec. 17, 2020
Document Information [Line Items]    
Document Period End Date   Dec. 17, 2020
Document Type   8-K
Document Period End Date   Dec. 17, 2020
Entity Registrant Name   HERITAGE FINANCIAL CORP
Entity File Number 000-29480  
Entity Incorporation, State or Country Code   WA
Entity Tax Identification Number   91-1857900
Entity Address, Address Line One   201 Fifth Avenue SW,
Entity Address, City or Town   Olympia
Entity Address, State or Province   WA
Entity Address, Postal Zip Code   98501
City Area Code   (360)
Local Phone Number   943-1500
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Common stock, no par value
Trading Symbol   HFWA
Security Exchange Name   NASDAQ
Entity Emerging Growth Company   false
Entity Central Index Key   0001046025
Amendment Flag   false