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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2024
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of activity in accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | Securities | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | Available- | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | for-Sale |  | Plans |  | Derivatives |  | Loss
Balance as of January 1, 2023 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
Other comprehensive income (loss) before reclassifications | ​ |  | 7,498 | ​ |  | (109) | ​ |  | (8,091) | ​ |  | (702)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 3,130 | ​ |  | (1,055) | ​ |  | 1,427 | ​ |  | 3,502
Net other comprehensive income (loss) during the period | ​ |  | 10,628 | ​ |  | (1,164) | ​ |  | (6,664) | ​ |  | 2,800
Balance as of December 31, 2023 | ​ | $ | (90,242) | ​ | $ | (6,430) | ​ | $ | 5,093 | ​ | $ | (91,579)
Other comprehensive income (loss) before reclassifications | ​ |  | 14,703 | ​ |  | (1,087) | ​ |  | (5,782) | ​ |  | 7,834
Amounts reclassified from accumulated other comprehensive income | ​ |  | 31,772 | ​ |  | 18 | ​ |  | 6,937 | ​ |  | 38,727
Net other comprehensive income (loss) during the period | ​ |  | 46,475 | ​ |  | (1,069) | ​ |  | 1,155 | ​ |  | 46,561
Balance as of December 31, 2024 | ​ | $ | (43,767) | ​ | $ | (7,499) | ​ | $ | 6,248 | ​ | $ | (45,018)
Schedule of before and after tax amounts allocated to each component of other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) | ​ | 2024 |  | 2023 |  | 2022
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain (loss) during the period | ​ | $ | 23,218 | ​ | $ | 10,355 | ​ | $ | (138,630)
Reclassification adjustment for net losses included in net loss on sale of securities and other assets | ​ |  | 42,810 | ​ |  | 1,447 | ​ |  | —
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 3,028 | ​ | ​ | 3,142 | ​ | ​ | 2,953
Net change | ​ |  | 69,056 | ​ |  | 14,944 | ​ |  | (135,677)
Tax expense (benefit) | ​ |  | 22,581 | ​ |  | 4,316 | ​ |  | (42,671)
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | 46,475 | ​ |  | 10,628 | ​ |  | (93,006)
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | 26 | ​ |  | (1,547) | ​ |  | (3,715)
Change in the net actuarial gain | ​ |  | (1,426) | ​ |  | (190) | ​ |  | (2,062)
Net change | ​ |  | (1,400) | ​ |  | (1,737) | ​ |  | (5,777)
Tax benefit | ​ |  | (331) | ​ |  | (573) | ​ |  | (1,817)
Net change in pension and other postretirement obligations | ​ |  | (1,069) | ​ |  | (1,164) | ​ |  | (3,960)
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized (loss) gain during the period | ​ |  | (8,453) | ​ |  | (11,782) | ​ |  | 14,412
Reclassification adjustment for expense included in interest expense | ​ |  | 10,008 | ​ |  | 2,092 | ​ |  | (1,621)
Net change | ​ |  | 1,555 | ​ |  | (9,690) | ​ |  | 12,791
Tax expense (benefit) | ​ |  | 400 | ​ |  | (3,026) | ​ |  | 4,023
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 1,155 | ​ |  | (6,664) | ​ |  | 8,768
Other comprehensive income (loss), net of tax | ​ | $ | 46,561 | ​ | $ | 2,800 | ​ | $ | (88,198)
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