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STOCK-BASED COMPENSATION - Equity incentive plan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 06, 2023
Aug. 25, 2022
Mar. 31, 2023
Mar. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Expected future expense of non-vested options     $ 9,600  
Restricted Stock        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Expected period of recognition (in years)     6 years 2 months 12 days  
Expected future expense of non-vested RSUs     $ 11,700  
Option        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Expected period of recognition (in years)     6 years  
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 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 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%