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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
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, 2020 | ​ | $ | 4,621 | ​ | $ | (6,024) | ​ | $ | (4,537) | ​ | $ | (5,940)
Other comprehensive income (loss) before reclassifications | ​ |  | 11,221 | ​ |  | 802 | ​ |  | (12,153) | ​ |  | (130)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (3,148) | ​ |  | (864) | ​ |  | 4,158 | ​ |  | 146
Net other comprehensive income (loss) during the period | ​ |  | 8,073 | ​ |  | (62) | ​ |  | (7,995) | ​ |  | 16
Balance as of December 31, 2020 | ​ | $ | 12,694 | ​ | $ | (6,086) | ​ | $ | (12,532) | ​ | $ | (5,924)
Other comprehensive (loss) income before reclassifications | ​ |  | (19,733) | ​ |  | 5,520 | ​ |  | 14,883 | ​ |  | 670
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (825) | ​ |  | (740) | ​ |  | 638 | ​ |  | (927)
Net other comprehensive (loss) income during the period | ​ |  | (20,558) | ​ |  | 4,780 | ​ |  | 15,521 | ​ |  | (257)
Balance as of December 31, 2021 | ​ | $ | (7,864) | ​ | $ | (1,306) | ​ | $ | 2,989 | ​ | $ | (6,181)
Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2021 |  | 2020 |  | 2019
Change in unrealized holding gain or loss on securities: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ | $ | (28,865) | ​ | $ | 16,432 | ​ | $ | 9,693
Reclassification adjustment for net gains included in net gain on securities and other assets | ​ |  | (1,207) | ​ |  | (4,592) | ​ |  | (31)
Net change | ​ |  | (30,072) | ​ |  | 11,840 | ​ |  | 9,662
Tax (benefit) expense | ​ |  | (9,514) | ​ |  | 3,767 | ​ |  | 3,084
Net change in unrealized holding gain or loss on securities, net of reclassification adjustments and tax | ​ |  | (20,558) | ​ |  | 8,073 | ​ |  | 6,578
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (1,092) | ​ |  | (1,272) | ​ |  | 729
Reclassification adjustment for curtailment loss (gain) | ​ | ​ | 1,543 | ​ | ​ | (1,651) | ​ | ​ | —
Change in the net actuarial gain or loss | ​ |  | 6,563 | ​ |  | 2,817 | ​ |  | (296)
Net change | ​ |  | 7,014 | ​ |  | (106) | ​ |  | 433
Tax expense | ​ |  | 2,234 | ​ |  | (44) | ​ |  | 167
Net change in pension and other postretirement obligations | ​ |  | 4,780 | ​ |  | (62) | ​ |  | 266
Change in unrealized gain or loss on derivatives: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain or loss during the period | ​ |  | 5,277 | ​ |  | (24,449) | ​ |  | (8,254)
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | 16,505 | ​ | ​ | 6,596 | ​ | ​ | —
Reclassification adjustment for expense included in interest expense | ​ |  | 940 | ​ |  | 6,127 | ​ |  | (955)
Net change | ​ |  | 22,722 | ​ |  | (11,726) | ​ |  | (9,209)
Tax expense (benefit) | ​ |  | 7,201 | ​ |  | (3,731) | ​ |  | (2,925)
Net change in unrealized gain or loss on derivatives, net of reclassification adjustments and tax | ​ |  | 15,521 | ​ |  | (7,995) | ​ |  | (6,284)
Other comprehensive (loss) income, net of tax | ​ | $ | (257) | ​ | $ | 16 | ​ | $ | 560

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