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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2024
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of activity in accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
Balance as of January 1, 2024 | ​ | $ | (90,242) | ​ | $ | (6,430) | ​ | $ | 5,093 | ​ | $ | (91,579)
Other comprehensive income (loss) before reclassifications | ​ |  | 21,940 | ​ |  | 1,057 | ​ |  | (10,564) | ​ |  | 12,433
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 1,569 | ​ |  | (649) | ​ |  | 5,256 | ​ |  | 6,176
Net other comprehensive income (loss) during the period | ​ |  | 23,509 | ​ |  | 408 | ​ |  | (5,308) | ​ |  | 18,609
Balance as of September 30, 2024 | ​ | $ | (66,733) | ​ | $ | (6,022) | ​ | $ | (215) | ​ | $ | (72,970)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2023 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
Other comprehensive (loss) income before reclassifications | ​ |  | (15,338) | ​ |  | 952 | ​ |  | (229) | ​ |  | (14,615)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 2,666 | ​ |  | (781) | ​ |  | 196 | ​ |  | 2,081
Net other comprehensive loss (income) during the period | ​ |  | (12,672) | ​ |  | 171 | ​ |  | (33) | ​ |  | (12,534)
Balance as of September 30, 2023 | ​ | $ | (113,542) | ​ | $ | (5,095) | ​ | $ | 11,724 | ​ | $ | (106,913)
Schedule of before and after tax amounts allocated to each component of other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(In thousands) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | 25,135 | ​ | $ | (4,374) | ​ | $ | 32,254 | ​ | $ | (17,967) | ​
Reclassification adjustment for net losses included in net loss on sale of securities and other assets | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 1,447 | ​
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 765 | ​ |  | 788 | ​ | ​ | 2,301 | ​ | ​ | 2,341 | ​
Net change | ​ |  | 25,900 | ​ |  | (3,586) | ​ |  | 34,555 | ​ |  | (14,179) | ​
Tax expense (benefit) | ​ |  | 8,200 | ​ |  | (1,062) | ​ |  | 11,046 | ​ |  | (1,507) | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | 17,700 | ​ |  | (2,524) | ​ |  | 23,509 | ​ |  | (12,672) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (317) | ​ |  | (370) | ​ |  | (952) | ​ |  | (1,110) | ​
Change in the net actuarial gain | ​ |  | 520 | ​ |  | 518 | ​ |  | 1,560 | ​ |  | 1,553 | ​
Net change | ​ |  | 203 | ​ | ​ | 148 | ​ |  | 608 | ​ |  | 443 | ​
Tax expense | ​ |  | 65 | ​ |  | 185 | ​ |  | 200 | ​ |  | 272 | ​
Net change in pension and other postretirement obligations | ​ |  | 138 | ​ |  | (37) | ​ |  | 408 | ​ |  | 171 | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized loss during the period | ​ |  | (14,500) | ​ |  | (246) | ​ |  | (15,483) | ​ |  | (771) | ​
Reclassification adjustment for expense included in interest expense | ​ |  | 2,752 | ​ |  | 293 | ​ |  | 7,707 | ​ |  | 279 | ​
Net change | ​ |  | (11,748) | ​ |  | 47 | ​ |  | (7,776) | ​ |  | (492) | ​
Tax (benefit) expense | ​ |  | (3,720) | ​ |  | 14 | ​ |  | (2,468) | ​ |  | (459) | ​
Net change in unrealized (loss) gain on derivatives, net of reclassification adjustments and tax | ​ |  | (8,028) | ​ |  | 33 | ​ |  | (5,308) | ​ |  | (33) | ​
Other comprehensive income (loss), net of tax | ​ | $ | 9,810 | ​ | $ | (2,528) | ​ | $ | 18,609 | ​ | $ | (12,534) | ​
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