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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2021
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
​ | ​ | Securities | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | Available- | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | for-Sale |  | Plans |  | Derivatives |  | Income (Loss)
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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2020 | ​ | $ | 4,621 | ​ | $ | (6,024) | ​ | $ | (4,537) | ​ | $ | (5,940)
Other comprehensive income (loss) before reclassifications | ​ |  | 10,783 | ​ |  | 423 | ​ |  | (17,150) | ​ |  | (5,944)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (2,302) | ​ |  | 133 | ​ |  | 2,514 | ​ |  | 345
Net other comprehensive income (loss) during the period | ​ |  | 8,481 | ​ |  | 556 | ​ |  | (14,636) | ​ |  | (5,599)
Balance as of September 30, 2020 | ​ | $ | 13,102 | ​ | $ | (5,468) | ​ | $ | (19,173) | ​ | $ | (11,539)
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) |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
Change in unrealized holding gain or loss on securities available-for-sale: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ | $ | (8,654) | ​ | $ | 1,716 | ​ | $ | (15,222) | ​ | $ | 15,769
Reclassification adjustment for net gains included in net gain on securities and other assets | ​ |  | — | ​ |  | (215) | ​ |  | (1,207) | ​ |  | (3,357)
Net change | ​ |  | (8,654) | ​ |  | 1,501 | ​ |  | (16,429) | ​ |  | 12,412
Tax (benefit) expense | ​ |  | (2,714) | ​ |  | 475 | ​ |  | (5,226) | ​ |  | 3,931
Net change in unrealized holding gain or loss on securities available-for-sale, net of reclassification adjustments and tax | ​ |  | (5,940) | ​ |  | 1,026 | ​ |  | (11,203) | ​ |  | 8,481
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (735) | ​ |  | 4 | ​ |  | (1,595) | ​ |  | 194
Reclassification adjustment for curtailment loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,543 | ​ | ​ | —
Change in the net actuarial gain or loss | ​ |  | 941 | ​ |  | 267 | ​ |  | 2,470 | ​ |  | 619
Net change | ​ |  | 206 | ​ | ​ | 271 | ​ |  | 2,418 | ​ |  | 813
Tax expense | ​ |  | 65 | ​ |  | 86 | ​ |  | 795 | ​ |  | 257
Net change in pension and other postretirement obligations | ​ |  | 141 | ​ |  | 185 | ​ |  | 1,623 | ​ |  | 556
Change in unrealized gain or loss on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ |  | 225 | ​ |  | 100 | ​ |  | 3,767 | ​ |  | (25,098)
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505 | ​ | ​ | —
Reclassification adjustment for expense included in interest expense | ​ |  | 38 | ​ |  | 2,319 | ​ |  | 902 | ​ |  | 3,679
Net change | ​ |  | 263 | ​ |  | 2,419 | ​ |  | 21,174 | ​ |  | (21,419)
Tax expense (benefit) | ​ |  | 82 | ​ |  | 766 | ​ |  | 6,712 | ​ |  | (6,783)
Net change in unrealized gain or loss on derivatives, net of reclassification adjustments and tax | ​ |  | 181 | ​ |  | 1,653 | ​ |  | 14,462 | ​ |  | (14,636)
Other comprehensive (loss) income, net of tax | ​ | $ | (5,618) | ​ | $ | 2,864 | ​ | $ | 4,882 | ​ | $ | (5,599)

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