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Benefit Plans Stock-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense $ 770,000 $ 708,000
First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Tax benefit $ 162,000 $ 149,000
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 0  
Stock Options | First Financial Northwest Inc 2016 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 1,400,000  
Number of shares remaining for grant 969,834  
Stock Options | First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding number of options (in shares) 217,519 272,000
Contractual life 10 years  
Unrecognized compensation cost $ 0  
Restricted Stock | First Financial Northwest Inc 2016 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 400,000  
Number of shares remaining for grant 184,197  
Restricted Stock | First Financial Northwest, Inc. 2008 Equity Incentive Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 84,000  
Unrecognized compensation cost recognition period 2 months  
Total fair value of shares vested $ 790,000 $ 402,000