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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 9 Months Ended
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Sep. 30, 2022
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 | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Gain (loss) recognized in other comprehensive income | ​ | $ | 5,387 | ​ | $ | 225 | ​ | $ | 14,548 | ​ | $ | 3,767
Gain recognized on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505
Gain (loss) reclassified from other comprehensive income into interest expense | ​ |  | 546 | ​ |  | (38) | ​ |  | 569 | ​ |  | (902)
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2022 | ​ | December 31, 2021
​ | ​ | ​ | ​ | 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 | ​ | $ | 18,336 | ​ | $ | — |  | 4 | ​ | $ | 150,000 | ​ | $ | 4,358 | ​ | $ | —
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2022
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 187 | ​ | $ | 1,225,306 | ​ | $ | — | ​ | $ | (133,938)
Loan level interest rate floors with borrower | ​ | 41 | ​ | ​ | 328,864 | ​ | ​ | — | ​ | ​ | (10,405)
Loan level interest rate swaps with third-party counterparties | ​ | 187 | ​ | ​ | 1,225,306 | ​ | ​ | 133,938 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 41 | ​ |  | 328,864 | ​ |  | 10,405 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 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 |  | 98 | ​ | $ | 599,003 | ​ | $ | 27,440 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 87 | ​ |  | 612,610 | ​ |  | — | ​ |  | (12,620)
Loan level interest rate floors with borrower | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | 615 | ​ | ​ | —
Loan level interest rate floors with borrower | ​ | 12 | ​ | ​ | 100,774 | ​ | ​ | — | ​ | ​ | (53)
Loan level interest rate swaps with third-party counterparties |  | 98 | ​ |  | 599,003 | ​ |  | — | ​ |  | (27,440)
Loan level interest rate swaps with third-party counterparties | ​ | 87 | ​ | ​ | 612,610 | ​ | ​ | 12,620 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | — | ​ | ​ | (615)
Loan level interest rate floors with third-party counterparties |  | 12 | ​ |  | 100,774 | ​ |  | 53 | ​ |  | —
Loan Level Derivative Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021
Loan level derivative income | ​ | $ | 549 | ​ | $ | 445 | ​ | $ | 2,240 | ​ | $ | 2,796

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