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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
Derivatives, Fair Value [Line Items] |
Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) | The table below presents the effect of the cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss) as of March 31, 2021 and 2020.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
(In thousands) | ​ | 2021 |  | 2020 | ​
Gain recognized in other comprehensive income | ​ | $ | 21,453 | ​ | $ | (20,581) | ​
Gain reclassified from other comprehensive income into interest expense | ​ |  | 854 | ​ |  | 204 | ​
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Statements of Financial Condition as of the periods indicated.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(Dollars in thousands) |  | Count |  | Amount |  | Assets |  | Liabilities |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  | ​ |
Interest rate swaps related to FHLBNY advances |  | 4 | ​ | $ | 150,000 | ​ | $ | 3,944 | ​ | $ | — |  | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest rate swaps related to FHLBNY advances |  | — | ​ | $ | — | ​ | $ | — | ​ | $ | — |  | 32 | ​ | $ | 655,000 | ​ | $ | — | ​ | $ | (18,442)
Not Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 109 | ​ | $ | 689,408 | ​ | $ | 28,104 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 72 | ​ |  | 543,095 | ​ |  | — | ​ |  | (16,468)
Loan level interest rate floors with borrower | ​ | 46 | ​ | ​ | 406,923 | ​ | ​ | — | ​ | ​ | (5,294)
Loan level interest rate swaps with third-party counterparties |  | 109 | ​ |  | 689,408 | ​ |  | — | ​ |  | (28,104)
Loan level interest rate swaps with third-party counterparties | ​ | 72 | ​ | ​ | 543,095 | ​ | ​ | 16,468 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 46 | ​ |  | 406,923 | ​ |  | 5,294 | ​ |  | —
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 65 | ​ | $ | 570,277 | ​ | $ | 24,764 | ​ | $ | —
Loan level interest rate floors with borrower |  | 41 | ​ |  | 364,643 | ​ |  | — | ​ |  | (5,832)
Loan level interest rate swaps with third-party counterparties |  | 65 | ​ |  | 570,277 | ​ |  | — | ​ |  | (24,764)
Loan level interest rate floors with third-party counterparties |  | 41 | ​ |  | 364,643 | ​ |  | 5,832 | ​ |  | —
Loan Level Derivative Income | Loan level derivative income is recognized on the mark-to-market of the interest rate swap as a fair value adjustment at the time the transaction is closed. Total loan level derivative income is included in non-interest income as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) | ​ | 2021 |  | 2020
Loan level derivative income | ​ | $ | 1,792 | ​ | $ | 1,163

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