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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 09, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-33652    
Entity Registrant Name FIRST FINANCIAL NORTHWEST, INC.    
Entity Incorporation, State or Country Code WA    
Entity Tax Identification Number 26-0610707    
Entity Address, Address Line One 201 Wells Avenue South    
Entity Address, City or Town Renton    
Entity Address, State or Province WA    
Entity Address, Postal Zip Code 98057    
City Area Code (425)    
Local Phone Number 255-4400    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 123,324,741
Entity Common Stock, Shares Outstanding   9,148,086  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive proxy statement for the Annual Meeting of Shareholders to be held in May 2023 (the “Proxy Statement”), are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 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.
    
Amendment Flag false    
Entity Central Index Key 0001401564    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY