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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2025 | ​ | $ | (43,767) | ​ | $ | (7,499) | ​ | $ | 6,248 | ​ | $ | (45,018)
Other comprehensive income (loss) before reclassifications | ​ |  | 9,056 | ​ |  | 3,437 | ​ |  | (8,992) | ​ |  | 3,501
Amounts reclassified from accumulated other comprehensive income | ​ |  | 925 | ​ |  | 28 | ​ |  | 2,627 | ​ |  | 3,580
Net other comprehensive income (loss) during the period | ​ |  | 9,981 | ​ |  | 3,465 | ​ |  | (6,365) | ​ |  | 7,081
Balance as of June 30, 2025 | ​ | $ | (33,786) | ​ | $ | (4,034) | ​ | $ | (117) | ​ | $ | (37,937)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2024 | ​ | $ | (90,242) | ​ | $ | (6,430) | ​ | $ | 5,093 | ​ | $ | (91,579)
Other comprehensive income (loss) before reclassifications | ​ |  | 4,761 | ​ |  | 703 | ​ |  | (659) | ​ |  | 4,805
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 1,048 | ​ |  | (433) | ​ |  | 3,379 | ​ |  | 3,994
Net other comprehensive income during the period | ​ |  | 5,809 | ​ |  | 270 | ​ |  | 2,720 | ​ |  | 8,799
Balance as of June 30, 2024 | ​ | $ | (84,433) | ​ | $ | (6,160) | ​ | $ | 7,813 | ​ | $ | (82,780)
Schedule of before and after tax amounts allocated to each component of other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2025 |  | 2024 | ​ | 2025 |  | 2024
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain during the period | ​ | $ | 3,306 | ​ | $ | 3,775 | ​ | $ | 11,266 | ​ | $ | 7,119
Reclassification adjustment for net gain included in net gain on securities and other assets | ​ |  | (149) | ​ |  | — | ​ |  | (149) | ​ |  | —
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 759 | ​ |  | 818 | ​ | ​ | 1,483 | ​ | ​ | 1,536
Credit loss expense | ​ | ​ | 907 | ​ | ​ | — | ​ | ​ | 1,800 | ​ | ​ | —
Net change | ​ |  | 4,823 | ​ |  | 4,593 | ​ |  | 14,400 | ​ |  | 8,655
Tax expense | ​ |  | 1,480 | ​ |  | 1,634 | ​ |  | 4,419 | ​ |  | 2,846
Net change in unrealized gain on securities, net of reclassification adjustments and tax | ​ |  | 3,343 | ​ |  | 2,959 | ​ |  | 9,981 | ​ |  | 5,809
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for benefit (expense) included in other expense | ​ |  | 128 | ​ |  | (318) | ​ |  | 41 | ​ |  | (635)
Change in the net actuarial gain | ​ |  | 104 | ​ |  | 520 | ​ |  | 4,958 | ​ |  | 1,040
Net change | ​ |  | 232 | ​ | ​ | 202 | ​ |  | 4,999 | ​ |  | 405
Tax expense | ​ |  | 71 | ​ |  | 77 | ​ |  | 1,534 | ​ |  | 135
Net change in pension and other postretirement obligations | ​ |  | 161 | ​ |  | 125 | ​ |  | 3,465 | ​ |  | 270
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized loss during the period | ​ |  | (5,407) | ​ |  | (3,128) | ​ |  | (12,974) | ​ |  | (983)
Reclassification adjustment for expense included in interest expense | ​ |  | 1,950 | ​ |  | 2,520 | ​ |  | 3,790 | ​ |  | 4,955
Net change | ​ |  | (3,457) | ​ |  | (608) | ​ |  | (9,184) | ​ |  | 3,972
Tax (benefit) expense | ​ |  | (1,061) | ​ |  | (210) | ​ |  | (2,819) | ​ |  | 1,252
Net change in unrealized (loss) gain on derivatives, net of reclassification adjustments and tax | ​ |  | (2,396) | ​ |  | (398) | ​ |  | (6,365) | ​ |  | 2,720
Other comprehensive income, net of tax | ​ | $ | 1,108 | ​ | $ | 2,686 | ​ | $ | 7,081 | ​ | $ | 8,799
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