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COVER PAGE - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 18, 2020
Jun. 30, 2019
Cover Page [Abstract]      
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-29480    
Entity Registrant Name HERITAGE FINANCIAL CORP    
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    
Title of 12(b) Security Common Stock    
Trading Symbol HFWA    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer false    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
City Area Code 360    
Local Phone Number 943-1500    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 1,073,270,321
Entity Common Stock, Shares Outstanding   36,483,089  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2020 Annual Meeting of Shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2020 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.