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Stock-based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
May 05, 2020
Nov. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted (in shares) 0      
Restricted Stock Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares) 35,100 0    
Vesting period 5 years      
Amortization period 5 years      
Total unrecognized compensation costs $ 3,100      
Remaining weighted-average vesting period 3 years 5 months 15 days      
First Northwest Bancorp 2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)       1,834,050
Number of shares available for grant (in shares) 1,322,050      
Total compensation expense $ 304 $ 283    
First Northwest Bancorp 2015 Equity Incentive Plan | Restricted Stock Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant (in shares) 12,014      
Director | First Northwest Bancorp 2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense $ 85 $ 85    
Subsequent Event | First Northwest Bancorp 2020 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized (in shares)     520,000