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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% |  |  |  |

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