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Benefit Plans Stock-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense $ 501,000 $ 650,000
First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense, related tax benefit $ 105,000 $ 137,000
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Description The Plan authorized the grant of stock options amounting to 2,285,280 shares to Company directors, advisory directors, officers, and employees. Option awards are granted with an exercise price equal to the market price of First Financial Northwest’s common stock at the grant date.  
Share-based Compensation Arrangement by Share-based Payment These option awards have a vesting period of five years, with 20% vesting on the anniversary date of each grant date, and a contractual life of ten years. Any unexercised stock options will expire ten years after the grant date, or sooner in the event of the award recipient’s death, disability or termination of service with the Company.  
Stock Options | First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 50,000 0
Award vesting period 5 years  
Percentage vesting per annum 20.00%  
Contractual life 10 years  
Unrecognized compensation cost $ 32,000  
Unrecognized compensation cost recognition period 11 months  
Stock Options | First Financial Northwest Inc 2016 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 1,400,000  
Number of shares remaining for grant 1,240,114  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Description The Plan authorized the grant of restricted stock awards amounting to 914,112 shares to directors, advisory directors, officers and employees. Compensation expense is recognized over the vesting period of the awards based on the fair value of the stock at the grant date. The restricted stock awards’ fair value is equal to the value on the grant date. Shares awarded as restricted stock vest ratably over a five-year period beginning at the grant date with 20% vesting on the anniversary date of each grant date.  
Restricted Stock | First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 46,000  
Unrecognized compensation cost recognition period 2 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 459,000 $ 238,000
Restricted Stock | First Financial Northwest Inc 2016 Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 400,000  
Number of shares remaining for grant 320,057