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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 315,000 $ 224,000 $ 558,000 $ 367,000
Tax benefit from compensation expense $ 66,000 $ 47,000 $ 117,000 $ 77,000
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   1,400,000  
Available for grant (shares) 1,060,922   1,060,922  
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   400,000  
Available for grant (shares) 230,461   230,461  
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 $ 0   $ 0  
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 10,080   55,673  
Compensation cost not yet recognized $ 259,000   $ 259,000  
Compensation cost not yet recognized, weighted average vesting period     5 months  
First Financial Northwest, Inc. 2008 Equity Incentive Plan | Restricted Stock | Expected to exercise at March 31 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 307,000