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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 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 | ​ |  | 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2023 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
Other comprehensive (loss) income before reclassifications | ​ |  | (12,259) | ​ |  | 729 | ​ |  | (56) | ​ |  | (11,586)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 2,111 | ​ |  | (521) | ​ |  | (10) | ​ |  | 1,580
Net other comprehensive loss during the period | ​ |  | (10,148) | ​ |  | 208 | ​ |  | (66) | ​ |  | (10,006)
Balance as of June 30, 2023 | ​ | $ | (111,018) | ​ | $ | (5,058) | ​ | $ | 11,691 | ​ | $ | (104,385)
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) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | 3,775 | ​ | $ | (11,291) | ​ | $ | 7,119 | ​ | $ | (13,593) | ​
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 | ​ | ​ | 818 | ​ |  | 796 | ​ | ​ | 1,536 | ​ | ​ | 1,553 | ​
Net change | ​ |  | 4,593 | ​ |  | (10,495) | ​ |  | 8,655 | ​ |  | (10,593) | ​
Tax expense | ​ |  | 1,634 | ​ |  | (3,109) | ​ |  | 2,846 | ​ |  | (445) | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | 2,959 | ​ |  | (7,386) | ​ |  | 5,809 | ​ |  | (10,148) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (318) | ​ |  | (370) | ​ |  | (635) | ​ |  | (740) | ​
Change in the net actuarial gain | ​ |  | 520 | ​ |  | 814 | ​ |  | 1,040 | ​ |  | 1,035 | ​
Net change | ​ |  | 202 | ​ | ​ | 444 | ​ |  | 405 | ​ |  | 295 | ​
Tax expense (benefit) | ​ |  | 77 | ​ |  | 131 | ​ |  | 135 | ​ |  | 87 | ​
Net change in pension and other postretirement obligations | ​ |  | 125 | ​ |  | 313 | ​ |  | 270 | ​ |  | 208 | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized (loss) gain during the period | ​ |  | (3,128) | ​ |  | 1,586 | ​ |  | (983) | ​ |  | (525) | ​
Reclassification adjustment for expense included in interest expense | ​ |  | 2,520 | ​ |  | 299 | ​ |  | 4,955 | ​ |  | (14) | ​
Net change | ​ |  | (608) | ​ |  | 1,885 | ​ |  | 3,972 | ​ |  | (539) | ​
Tax (benefit) expense | ​ |  | (210) | ​ |  | 559 | ​ |  | 1,252 | ​ |  | (473) | ​
Net change in unrealized (loss) gain on derivatives, net of reclassification adjustments and tax | ​ |  | (398) | ​ |  | 1,326 | ​ |  | 2,720 | ​ |  | (66) | ​
Other comprehensive income (loss), net of tax | ​ | $ | 2,686 | ​ | $ | (5,747) | ​ | $ | 8,799 | ​ | $ | (10,006) | ​
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