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DERIVATIVES AND HEDGING ACTIVITIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Oct. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Participating Mortgage Loans, Mortgage Obligations, Amount |  | $ 27,300 |  |
Number of Participation loans purchased | item |  | 4 |  |
Interest Rate Swap | Cash flow hedges |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount |  |  |  | $ 400,000
Derivative, Fixed Interest Rate |  |  |  | 3.018%
Expected interest income on termination | $ 2,000 |  |  |
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Notional Amount |  | $ 124,000 | $ 142,800 |
Number of Interest Rate Derivatives Held |  | 15 | 19 |
Valley Bank | Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of Loans Acquired | item |  | 7 |  |
Valley Bank | Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Number of Loans Acquired | item |  | 7 |  |
Number of Loans Paid Off | item |  | 5 |  |
Derivative, Notional Amount |  | $ 508 | $ 584 |
Number of Interest Rate Derivatives Held |  | 2 |  |

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