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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 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 income (loss) before reclassifications | ​ |  | (10,570) | ​ |  | 1,659 | ​ |  | 16,476 | ​ |  | 7,565
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (822) | ​ |  | (288) | ​ |  | — | ​ |  | (1,110)
Net other comprehensive (loss) income during the period | ​ |  | (11,392) | ​ |  | 1,371 | ​ |  | 16,476 | ​ |  | 6,455
Balance as of March 31, 2021 | ​ | $ | 1,302 | ​ | $ | (4,715) | ​ | $ | 3,944 | ​ | $ | 531
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2020 | ​ | $ | 4,621 | ​ | $ | (6,024) | ​ | $ | (4,537) | ​ | $ | (5,940)
Other comprehensive income (loss) before reclassifications | ​ |  | 7,049 | ​ |  | 120 | ​ |  | (14,060) | ​ |  | (6,891)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (5) | ​ |  | 65 | ​ |  | 139 | ​ |  | 199
Net other comprehensive income (loss) during the period | ​ |  | 7,044 | ​ |  | 185 | ​ |  | (13,921) | ​ |  | (6,692)
Balance as of March 31, 2020 | ​ | $ | 11,665 | ​ | $ | (5,839) | ​ | $ | (18,458) | ​ | $ | (12,632)
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
​ | ​ | March 31,
(In thousands) | ​ | 2021 |  | 2020
Change in unrealized holding gain or loss on securities available-for-sale: | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ | $ | (15,534) | ​ | $ | 10,260
Reclassification adjustment for net (gains) losses included in net gain on securities and other assets | ​ |  | (1,187) | ​ |  | (8)
Net change | ​ |  | (16,721) | ​ |  | 10,252
Tax (benefit) expense | ​ |  | (5,329) | ​ |  | 3,208
Net change in unrealized holding gain or loss on securities available-for-sale | ​ |  | (11,392) | ​ |  | 7,044
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (422) | ​ |  | 95
Reclassification adjustment for curtailment loss | ​ | ​ | 1,543 | ​ | ​ | —
Change in the net actuarial gain or loss | ​ |  | 885 | ​ |  | 176
Net change | ​ |  | 2,006 | ​ |  | 271
Tax expense | ​ |  | 635 | ​ |  | 86
Net change in pension and other postretirement obligations | ​ |  | 1,371 | ​ |  | 185
Change in unrealized gain or loss on derivatives: | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ |  | 21,453 | ​ |  | (20,581)
Reclassification adjustment for expense included in interest expense | ​ |  | 854 | ​ |  | 204
Net change | ​ |  | 22,307 | ​ |  | (20,377)
Tax expense (benefit) | ​ |  | 5,831 | ​ |  | (6,456)
Net change in unrealized gain or loss on derivatives | ​ |  | 16,476 | ​ |  | (13,921)
Other comprehensive income (loss), net of tax | ​ | $ | 6,455 | ​ | $ | (6,692)

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