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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2022
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Activity in Accumulated Other Comprehensive Income (Loss), Net of Tax | Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2021 | ​ | $ | 12,694 | ​ | $ | (6,086) | ​ | $ | (12,532) | ​ | $ | (5,924)
Other comprehensive (loss) income before reclassifications | ​ |  | (10,378) | ​ |  | 2,706 | ​ |  | 13,850 | ​ |  | 6,178
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (826) | ​ |  | (1,082) | ​ |  | 612 | ​ |  | (1,296)
Net other comprehensive (loss) income during the period | ​ |  | (11,204) | ​ |  | 1,624 | ​ |  | 14,462 | ​ |  | 4,882
Balance as of September 30, 2021 | ​ | $ | 1,490 | ​ | $ | (4,462) | ​ | $ | 1,930 | ​ | $ | (1,042)
Other Comprehensive Income (Loss) | The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the table below for the periods indicated.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | (39,692) | ​ | $ | (8,654) | ​ | $ | (142,980) | ​ | $ | (15,222) | ​
Reclassification adjustment for net gains included in net gain on sale of securities and other assets | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (1,207) | ​
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 1,112 | ​ |  | — | ​ | ​ | 2,111 | ​ | ​ | — | ​
Net change | ​ |  | (38,580) | ​ |  | (8,654) | ​ |  | (140,869) | ​ |  | (16,429) | ​
Tax benefit | ​ |  | (12,133) | ​ |  | (2,714) | ​ |  | (44,304) | ​ |  | (5,226) | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | (26,447) | ​ |  | (5,940) | ​ |  | (96,565) | ​ |  | (11,203) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (935) | ​ |  | (735) | ​ |  | (2,805) | ​ |  | (1,595) | ​
Reclassification adjustment for curtailment loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,543 | ​
Change in the net actuarial gain | ​ |  | 997 | ​ |  | 941 | ​ |  | 2,992 | ​ |  | 2,470 | ​
Net change | ​ |  | 62 | ​ | ​ | 206 | ​ |  | 187 | ​ |  | 2,418 | ​
Tax expense | ​ |  | 20 | ​ |  | 65 | ​ |  | 59 | ​ |  | 795 | ​
Net change in pension and other postretirement obligations | ​ |  | 42 | ​ |  | 141 | ​ |  | 128 | ​ |  | 1,623 | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ |  | 5,387 | ​ |  | 225 | ​ |  | 14,548 | ​ |  | 3,767 | ​
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505 | ​
Reclassification adjustment for expense included in interest expense | ​ |  | (546) | ​ |  | 38 | ​ |  | (569) | ​ |  | 902 | ​
Net change | ​ |  | 4,841 | ​ |  | 263 | ​ |  | 13,979 | ​ |  | 21,174 | ​
Tax expense | ​ |  | 1,522 | ​ |  | 82 | ​ |  | 4,397 | ​ |  | 6,712 | ​
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 3,319 | ​ |  | 181 | ​ |  | 9,582 | ​ |  | 14,462 | ​
Other comprehensive (loss) income, net of tax | ​ | $ | (23,086) | ​ | $ | (5,618) | ​ | $ | (86,855) | ​ | $ | 4,882 | ​

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