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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 6 Months Ended
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Jun. 30, 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) for the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
(In thousands) |  | 2021 |  | 2020 | ​ | 2021 |  | 2020 | ​
(Loss) gain recognized in other comprehensive income | ​ | $ | (1,406) | ​ | $ | (4,617) | ​ | $ | 3,542 | ​ | $ | (25,198) | ​
Gain recognized on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505 | ​ | ​ | — | ​
Gain (loss) reclassified from other comprehensive income into interest expense | ​ |  | (10) | ​ |  | (1,156) | ​ |  | (864) | ​ |  | (1,360) | ​
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 | ​ | $ | 2,547 | ​ | $ | — |  | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Interest rate swaps related to FHLBNY advances |  | — | ​ | $ | — | ​ | $ | — | ​ | $ | — |  | 32 | ​ | $ | 655,000 | ​ | $ | — | ​ | $ | (18,442)
Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 137 | ​ | $ | 937,092 | ​ | $ | 42,753 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 49 | ​ |  | 314,786 | ​ |  | — | ​ |  | (4,750)
Loan level interest rate floors with borrower | ​ | 47 | ​ | ​ | 407,249 | ​ | ​ | — | ​ | ​ | (4,743)
Loan level interest rate swaps with third-party counterparties |  | 137 | ​ |  | 937,092 | ​ |  | — | ​ |  | (42,753)
Loan level interest rate swaps with third-party counterparties | ​ | 49 | ​ | ​ | 314,786 | ​ | ​ | 4,750 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 47 | ​ |  | 407,249 | ​ |  | 4,743 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
Loan level derivative income | ​ | $ | 559 | ​ | $ | 2,494 | ​ | $ | 2,351 | ​ | $ | 3,657

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