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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 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 | ​ |  | 2,360 | ​ |  | 361 | ​ |  | 1,457 | ​ |  | 4,178
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 490 | ​ |  | (216) | ​ |  | 1,661 | ​ |  | 1,935
Net other comprehensive income during the period | ​ |  | 2,850 | ​ |  | 145 | ​ |  | 3,118 | ​ |  | 6,113
Balance as of March 31, 2024 | ​ | $ | (87,392) | ​ | $ | (6,285) | ​ | $ | 8,211 | ​ | $ | (85,466)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2023 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
Other comprehensive (loss) income before reclassifications | ​ |  | (4,313) | ​ |  | 155 | ​ |  | (1,172) | ​ |  | (5,330)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 1,551 | ​ |  | (260) | ​ |  | (220) | ​ |  | 1,071
Net other comprehensive loss during the period | ​ |  | (2,762) | ​ |  | (105) | ​ |  | (1,392) | ​ |  | (4,259)
Balance as of March 31, 2023 | ​ | $ | (103,632) | ​ | $ | (5,371) | ​ | $ | 10,365 | ​ | $ | (98,638)
Schedule of before and after tax amounts allocated to each component of other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
(In thousands) |  | 2024 |  | 2023 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | 3,344 | ​ | $ | (2,302) | ​
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 | ​ | ​ | 718 | ​ | ​ | 757 | ​
Net change | ​ |  | 4,062 | ​ |  | (98) | ​
Tax expense | ​ |  | 1,212 | ​ |  | 2,664 | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | 2,850 | ​ |  | (2,762) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (317) | ​ |  | (370) | ​
Change in the net actuarial gain | ​ |  | 520 | ​ |  | 221 | ​
Net change | ​ |  | 203 | ​ |  | (149) | ​
Tax expense (benefit) | ​ |  | 58 | ​ |  | (44) | ​
Net change in pension and other postretirement obligations | ​ |  | 145 | ​ |  | (105) | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ |  | 2,145 | ​ |  | (2,111) | ​
Reclassification adjustment for expense included in interest expense | ​ |  | 2,435 | ​ |  | (313) | ​
Net change | ​ |  | 4,580 | ​ |  | (2,424) | ​
Tax expense (benefit) | ​ |  | 1,462 | ​ |  | (1,032) | ​
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 3,118 | ​ |  | (1,392) | ​
Other comprehensive income (loss), net of tax | ​ | $ | 6,113 | ​ | $ | (4,259) | ​
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