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DERIVATIVES AND HEDGING ACTIVITIES - Classification on Consolidated Statements of Financial Condition (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) DerivativeInstrument | Dec. 31, 2021 USD ($) DerivativeInstrument | Dec. 31, 2020 USD ($)
Cash Flow Hedges |  |  |
Collateral received against obligations in net asset position | $ 17,800,000 | $ 4,600,000 |
Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Loan level derivative income | $ 3,637,000 | $ 2,909,000 | $ 8,872,000
Interest Rate Swaps Related to FHLBNY Advances [Member] | Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 4 | 4 |
Notional amount, assets | $ 150,000,000 | $ 150,000,000 |
Fair value assets | $ 17,150,000 | $ 4,358,000 |
Loan Level Interest Rate Swaps with Borrower (Assets) | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 3 | 98 |
Notional amount, assets | $ 53,311,000 | $ 599,003,000 |
Fair value assets | $ 1,524,000 | $ 27,440,000 |
Loan Level Interest Rate Swaps with Borrower (Liabilities) | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, liabilities | DerivativeInstrument | 185 |  |
Notional amount, liabilities | $ 1,214,736,000 |  |
Fair value liabilities | 126,751,000 |  |
Posted collateral | $ 0 |  |
Loan Level Interest Rate Swaps with Borrower 3 | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, liabilities | DerivativeInstrument |  | 87 |
Notional amount, liabilities |  | $ 612,610,000 |
Fair value liabilities |  | $ (12,620,000) |
Loan Level Interest Rate Floors with Borrower | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, liabilities | DerivativeInstrument | 40 | 12 |
Notional amount, liabilities | $ 326,309,000 | $ 100,774,000 |
Fair value liabilities | 9,060,000 | $ (53,000) |
Loan Level Interest Rate Floors with Borrower 2 | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument |  | 33 |
Notional amount, assets |  | $ 291,990,000 |
Fair value assets |  | $ 615,000 |
Loan Level Interest Rate Swaps with Third-part Counterparties 2 | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, liabilities | DerivativeInstrument |  | 98 |
Notional amount, liabilities |  | $ 599,003,000 |
Fair value liabilities |  | $ (27,440,000) |
Loan Level Interest Rate Swaps with Third-part Counterparties | Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Posted collateral | $ 0 |  |
Loan Level Interest Rate Swaps with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument |  | 87 |
Count, liabilities | DerivativeInstrument | 3 |  |
Notional amount, assets |  | $ 612,610,000 |
Notional amount, liabilities | $ 53,311,000 |  |
Fair value assets |  | $ 12,620,000 |
Fair value liabilities | 1,524,000 |  |
Posted collateral | $ 0 |  |
Loan level interest rate swaps with third party counterparties (Assets) | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 185 |  |
Notional amount, assets | $ 1,214,736,000 |  |
Fair value assets | $ 126,751,000 |  |
Loan Level Interest Rate Floors with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 40 | 33 |
Notional amount, assets | $ 326,309,000 |  |
Notional amount, liabilities |  | $ 291,990,000 |
Fair value assets | 9,060,000 |  |
Fair value liabilities |  | (615,000) |
Posted collateral |  | $ 14,000,000.0 |
Loan Level Interest Rate Floors with Third-part Counterparties 2 | Not Designated as Hedging Instrument [Member] |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument |  | 12 |
Notional amount, assets |  | $ 100,774,000 |
Fair value assets |  | $ 53,000 |
Posted collateral | $ 135,300,000 |  |

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