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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense $ 99,000 $ 125,000 $ 227,000 $ 314,000  
Tax benefit from compensation expense $ 21,000 $ 26,000 $ 48,000 $ 66,000  
Grants in period     0    
First Financial Northwest Inc 2016 Equity Incentive Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized         1,400,000
Available for grant (shares) 914,598   914,598    
Expiration period     10 years    
First Financial Northwest Inc 2016 Equity Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized         400,000
Available for grant (shares) 157,299   157,299    
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     5 years    
Percentage of options vesting per year     20.00%    
Expiration period     10 years    
Vested and available for exercise (in shares) 217,519   217,519    
Compensation cost not yet recognized $ 0   $ 0    
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation cost not yet recognized $ 273,000   $ 273,000    
Compensation cost not yet recognized, weighted average vesting period     8 months