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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2023
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Schedule of activity in accumulated other comprehensive (loss) income, net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
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 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2022 | ​ | $ | (7,864) | ​ | $ | (1,306) | ​ | $ | 2,989 | ​ | $ | (6,181)
Other comprehensive (loss) income before reclassifications | ​ |  | (96,565) | ​ |  | 2,051 | ​ |  | 9,972 | ​ |  | (84,542)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | — | ​ |  | (1,923) | ​ |  | (390) | ​ |  | (2,313)
Net other comprehensive (loss) income during the period | ​ |  | (96,565) | ​ |  | 128 | ​ |  | 9,582 | ​ |  | (86,855)
Balance as of September 30, 2022 | ​ | $ | (104,429) | ​ | $ | (1,178) | ​ | $ | 12,571 | ​ | $ | (93,036)
Schedule of before and after tax amounts allocated to each component of other comprehensive (loss) income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2023 |  | 2022 | ​ | 2023 |  | 2022
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized loss during the period | ​ | $ | (4,374) | ​ | $ | (39,692) | ​ | $ | (17,967) | ​ | $ | (142,980)
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 | ​ | ​ | 788 | ​ |  | 1,112 | ​ | ​ | 2,341 | ​ | ​ | 2,111
Net change | ​ |  | (3,586) | ​ |  | (38,580) | ​ |  | (14,179) | ​ |  | (140,869)
Tax benefit | ​ |  | (1,062) | ​ |  | (12,133) | ​ |  | (1,507) | ​ |  | (44,304)
Net change in unrealized loss on securities, net of reclassification adjustments and tax | ​ |  | (2,524) | ​ |  | (26,447) | ​ |  | (12,672) | ​ |  | (96,565)
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (370) | ​ |  | (935) | ​ |  | (1,110) | ​ |  | (2,805)
Change in the net actuarial gain | ​ |  | 518 | ​ |  | 997 | ​ |  | 1,553 | ​ |  | 2,992
Net change | ​ |  | 148 | ​ | ​ | 62 | ​ |  | 443 | ​ |  | 187
Tax expense | ​ |  | 185 | ​ |  | 20 | ​ |  | 272 | ​ |  | 59
Net change in pension and other postretirement obligations | ​ |  | (37) | ​ |  | 42 | ​ |  | 171 | ​ |  | 128
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized (loss) gain during the period | ​ |  | (246) | ​ |  | 5,387 | ​ |  | (771) | ​ |  | 14,548
Reclassification adjustment for expense included in interest expense | ​ |  | 293 | ​ |  | (546) | ​ |  | 279 | ​ |  | (569)
Net change | ​ |  | 47 | ​ |  | 4,841 | ​ |  | (492) | ​ |  | 13,979
Tax expense (benefit) | ​ |  | 14 | ​ |  | 1,522 | ​ |  | (459) | ​ |  | 4,397
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 33 | ​ |  | 3,319 | ​ |  | (33) | ​ |  | 9,582
Other comprehensive loss, net of tax | ​ | $ | (2,528) | ​ | $ | (23,086) | ​ | $ | (12,534) | ​ | $ | (86,855)
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