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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 80,000 $ 124,000  
Tax benefit from compensation expense $ 17,000 $ 26,000  
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) 1,207,658    
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) 303,829    
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    
Compensation cost not yet recognized $ 23,000    
Compensation cost not yet recognized, weighted average vesting period 8 months    
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 $ 198,000    
Compensation cost not yet recognized, weighted average vesting period 11 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 16,228   16,698
Granted, Shares 16,228    
Expected to vest in 2018 | First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 0    
Expected to vest and be available for exercise | First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 8,000    
Expected to exercise at March 31 2018 | First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, Shares 305,000