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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 01, 2021 | Jul. 15, 2021 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |
Stock price per share |  | $ 10 |  |  |
Gross offering proceeds |  | $ 277,700 |  |  |
Charitable contribution in cash |  | $ 1,500 |  |  |
Common shares purchased for ESOP |  | 2,281,800 |  |  |
Renewal or option to extend term (up to) |  |  | 10 years | 10 years |
Goodwill impairment |  |  |  | $ 0 | $ 15,460
Increase in deferred tax allowance |  |  | $ 16,800 | $ 16,800 |
Termination expense on multiemployer plan withdrawal | $ 11,200 |  |  |  |
Public stock offering |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Shares of common stock sold |  | 27,772,500 |  |  |
Donation of shares to Blue Foundry Charitable Foundation |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Shares of common stock sold |  | 750,000 |  |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Remaining lease terms |  |  | 1 year | 1 year |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Remaining lease terms |  |  | 15 years | 15 years |
Blue Foundry Bancorp - NJ |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Ownership interest percentage |  |  | 100.00% | 100.00% |

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