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DERIVATIVES AND HEDGING ACTIVITIES, Classification on Consolidated Statements of Financial Condition (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) DerivativeInstrument | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) DerivativeInstrument
Cash Flow Hedges |  |  |
Maximum period for future cash flows of forecasted transactions | 24 months |  |
Fair value assets | $ 7,100 |  |
Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Number of derivatives terminated | DerivativeInstrument | 34 |  |
Derivative notional amount | $ 785,000 |  |
Termination value of derivative | 16,500 |  |
Not Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Loan level derivative income | 1,792 | $ 1,163 |
Posted collateral | 10,800 |  |
Interest Rate Products | Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Estimated reclassification decrease to interest expense during next twelve months | $ 117 |  |
Interest Rate Swaps Related to FHLBNY Advances | Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 4 |  |
Count, liabilities | DerivativeInstrument |  |  | 32
Notional amount, assets | $ 150,000 |  |
Notional amount, liabilities |  |  | $ 655,000
Fair value assets | $ 3,944 |  |
Fair value liabilities |  |  | $ (18,442)
Loan Level Interest Rate Swaps with Borrower | Not Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 109 |  | 65
Count, liabilities | DerivativeInstrument | 72 |  |
Notional amount, assets | $ 689,408 |  | $ 570,277
Notional amount, liabilities | 543,095 |  |
Fair value assets | 28,104 |  | $ 24,764
Fair value liabilities | $ (16,468) |  |
Loan Level Interest Rate Floors with Borrower | Not Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 46 |  |
Count, liabilities | DerivativeInstrument |  |  | 41
Notional amount, assets | $ 406,923 |  |
Notional amount, liabilities |  |  | $ 364,643
Fair value assets | 0 |  |
Fair value liabilities | $ (5,294) |  | $ (5,832)
Loan Level Interest Rate Swaps with Third-part Counterparties | Not Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 109 |  |
Count, liabilities | DerivativeInstrument | 72 |  | 65
Notional amount, assets | $ 689,408 |  |
Notional amount, liabilities | 543,095 |  | $ 570,277
Fair value assets | 16,468 |  |
Fair value liabilities | $ (28,104) |  | $ (24,764)
Loan Level Interest Rate Floors with Third-part Counterparties | Not Designated as Hedging Instrument |  |  |
Cash Flow Hedges |  |  |
Count, assets | DerivativeInstrument | 46 |  | 41
Notional amount, assets | $ 406,923 |  | $ 364,643
Fair value assets | 5,294 |  | $ 5,832
Fair value liabilities | $ 0 |  |

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