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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 12 Months Ended
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Dec. 31, 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 loss as of December 31, 2022, 2021 and 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2022 |  | 2021 |  | 2020
Gain (loss) recognized in other comprehensive income (loss) | ​ | $ | 14,412 | ​ | $ | 5,277 | ​ | $ | (24,449)
Gain recognized on termination of derivatives | ​ | ​ | — | ​ | ​ | 16,505 | ​ | ​ | 6,596
Gain (loss) reclassified from other comprehensive income into interest expense | ​ |  | 1,621 | ​ |  | (940) | ​ |  | (6,127)
​
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 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 | ​ | $ | 17,150 | ​ | $ | — |  | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2022 |  | 2021 | ​ | 2020
Loan level derivative income | ​ | $ | 3,637 | ​ | $ | 2,909 | ​ | $ | 8,872
​

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