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STOCK-BASED COMPENSATION - Equity incentive plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 06, 2023
Aug. 25, 2022
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Granted (in shares)     0 0  
Expected future expense of non-vested options     $ 9,100 $ 9,100  
Restricted Stock          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Expected period of recognition (in years)       6 years  
Expected future expense of non-vested RSUs     $ 8,300 $ 8,300  
Option          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Expected period of recognition (in years)       5 years 9 months 18 days  
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan)          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Number of shares authorized for grant (in shares)   3,993,150      
Expected life of stock options (in years)         6 years 10 months 24 days
Risk free interest rate         3.94%
Volatility rate         29.41%
Expected dividend yield         0.88%
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Restricted Stock          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Number of shares authorized for grant (in shares)   1,140,900      
Initial period before vesting begins (in years)   1 year      
Shares granted (in shares) 372,540        
Aggregate grant date fair value $ 4,500        
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Restricted Stock | Share-Based Payment Arrangement, Tranche One          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years) 1 year        
Shares granted (in shares) 12,300        
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Restricted Stock | Share-Based Payment Arrangement, Tranche Two          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years) 7 years        
Shares granted (in shares) 360,240        
Term after grant date vesting starts (in years) 1 year        
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Restricted Stock | Minimum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years)   5 years      
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Restricted Stock | Maximum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years)   7 years      
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Option          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Number of shares authorized for grant (in shares)   2,852,250      
Initial period before vesting begins (in years)   1 year      
Expiration period of options (in years)       10 years  
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Option | Minimum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years)   5 years      
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Option | Maximum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years)   7 years      
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Performance Shares          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Vesting service period (in years) 7 years        
Shares granted (in shares) 360,240        
Aggregate grant date fair value $ 4,300        
Term of measurement period for PSUs (in years) 1 year        
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Performance Shares | Minimum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Percentage of target awarded 0.00%        
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan) | Performance Shares | Maximum          
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]          
Percentage of target awarded 100.00%