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STOCK-BASED COMPENSATION - Share-based compensation expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense		$ 0		$ 0
Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	$ 768,000		$ 1,444,000
Stock option expense | Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	397,000		796,000
Restricted stock expense | Blue Foundry Bancorp 2022 Equity Incentive Plan (Equity Plan)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total share-based compensation expense	$ 371,000		$ 648,000

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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