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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 9 Months Ended
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Sep. 30, 2023
Derivatives, Fair Value [Line Items] |
Schedule of effect of cash flow hedge accounting on accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2023 |  | 2022 | ​ | 2023 |  | 2022
(Loss) gain recognized in other comprehensive income (loss) | ​ | $ | (246) | ​ | $ | 5,387 | ​ | $ | (771) | ​ | $ | 14,548
(Loss) gain reclassified from other comprehensive income into interest expense | ​ |  | (293) | ​ |  | 546 | ​ |  | (279) | ​ |  | 569
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Schedule of fair value of derivative financial instruments and classification on consolidated statements of financial condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023 | ​ | December 31, 2022
​ | ​ | ​ | ​ | 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 | ​ | $ | 16,657 | ​ | $ | — |  | 4 | ​ | $ | 150,000 | ​ | $ | 17,150 | ​ | $ | —
Not Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Schedule of fair value of derivative financial instruments and classification on consolidated statements of financial condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 4 | ​ | $ | 34,050 | ​ | $ | 360 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 219 | ​ | ​ | 1,549,816 | ​ | ​ | — | ​ | ​ | 158,976
Loan level interest rate floors with borrower | ​ | 3 | ​ | ​ | 17,625 | ​ | ​ | — | ​ | ​ | —
Loan level interest rate floors with borrower | ​ | 25 | ​ | ​ | 178,032 | ​ | ​ | — | ​ | ​ | 1,376
Loan level interest rate swaps with third-party counterparties |  | 4 | ​ |  | 34,050 | ​ |  | — | ​ |  | 360
Loan level interest rate swaps with third-party counterparties | ​ | 219 | ​ | ​ | 1,549,816 | ​ | ​ | 158,976 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties | ​ | 3 | ​ | ​ | 17,625 | ​ | ​ | — | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 25 | ​ |  | 178,032 | ​ |  | 1,376 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 3 | ​ | $ | 53,311 | ​ | $ | 1,524 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 185 | ​ |  | 1,214,736 | ​ |  | — | ​ |  | 126,751
Loan level interest rate floors with borrower | ​ | 40 | ​ | ​ | 326,309 | ​ | ​ | — | ​ | ​ | 9,060
Loan level interest rate swaps with third-party counterparties |  | 3 | ​ |  | 53,311 | ​ |  | — | ​ |  | 1,524
Loan level interest rate swaps with third-party counterparties | ​ | 185 | ​ | ​ | 1,214,736 | ​ | ​ | 126,751 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties |  | 40 | ​ |  | 326,309 | ​ |  | 9,060 | ​ |  | —
Schedule of loan level derivative income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2023 |  | 2022 | ​ | 2023 |  | 2022
Loan level derivative income | ​ | $ | 783 | ​ | $ | 549 | ​ | $ | 6,353 | ​ | $ | 2,240

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