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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense $ 107,000 $ 326,000 $ 231,000 $ 409,000    
Tax benefit from compensation expense $ 22,000 $ 68,000 $ 48,000 $ 86,000    
Grants in period 50,000          
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) 1,207,274   1,207,274      
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) 328,637   328,637      
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 $ 283,000   $ 283,000      
Compensation cost not yet recognized, weighted average vesting period     3 years 10 months 6 days      
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 $ 181,000   $ 181,000      
Compensation cost not yet recognized, weighted average vesting period     8 months 5 days      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 16,698   16,698   16,698 20,987
Granted, Shares     16,698      
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   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 35,000          
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 280,000