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Stock-based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Nov. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options granted (in shares)   0 0  
Restricted Stock Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 0 402,500    
Vesting period   5 years    
Total unrecognized compensation costs $ 4,500,000 $ 4,500,000    
Remaining weighted-average vesting period   4 years 6 months    
First Northwest Bancorp 2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized       1,834,050
Total compensation expense $ 254,000 $ 510,000    
Director | First Northwest Bancorp 2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation expense   $ 98,000 $ 190,000