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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2022
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Activity in Accumulated Other Comprehensive Income (Loss), Net of Tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | Securities | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | Available- | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
​ |  | for-Sale |  | Plans |  | Derivatives |  | Loss
Balance as of January 1, 2021 | ​ | $ | 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 (loss) income before reclassifications | ​ |  | (95,030) | ​ |  | (1,413) | ​ |  | 9,879 | ​ |  | (86,564)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 2,024 | ​ |  | (2,547) | ​ |  | (1,111) | ​ |  | (1,634)
Net other comprehensive (loss) income during the period | ​ |  | (93,006) | ​ |  | (3,960) | ​ |  | 8,768 | ​ |  | (88,198)
Balance as of December 31, 2022 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
​
Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) | ​ | 2022 |  | 2021 |  | 2020
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain (loss) during the period | ​ | $ | (138,630) | ​ | $ | (28,865) | ​ | $ | 16,432
Reclassification adjustment for net gains included in net gain on sale of securities and other assets | ​ |  | — | ​ |  | (1,207) | ​ |  | (4,592)
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 2,953 | ​ | ​ | — | ​ | ​ | —
Net change | ​ |  | (135,677) | ​ |  | (30,072) | ​ |  | 11,840
Tax benefit | ​ |  | (42,671) | ​ |  | (9,514) | ​ |  | 3,767
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | (93,006) | ​ |  | (20,558) | ​ |  | 8,073
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (3,715) | ​ |  | (1,092) | ​ |  | (1,272)
Reclassification adjustment for curtailment loss | ​ | ​ | — | ​ | ​ | 1,543 | ​ | ​ | (1,651)
Change in the net actuarial gain | ​ |  | (2,062) | ​ |  | 6,563 | ​ |  | 2,817
Net change | ​ |  | (5,777) | ​ |  | 7,014 | ​ |  | (106)
Tax expense | ​ |  | (1,817) | ​ |  | 2,234 | ​ |  | (44)
Net change in pension and other postretirement obligations | ​ |  | (3,960) | ​ |  | 4,780 | ​ |  | (62)
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized gain (loss) during the period | ​ |  | 14,412 | ​ |  | 5,277 | ​ |  | (24,449)
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | — | ​ | ​ | 16,505 | ​ | ​ | 6,596
Reclassification adjustment for expense included in interest expense | ​ |  | (1,621) | ​ |  | 940 | ​ |  | 6,127
Net change | ​ |  | 12,791 | ​ |  | 22,722 | ​ |  | (11,726)
Tax expense | ​ |  | 4,023 | ​ |  | 7,201 | ​ |  | (3,731)
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 8,768 | ​ |  | 15,521 | ​ |  | (7,995)
Other comprehensive (loss) income, net of tax | ​ | $ | (88,198) | ​ | $ | (257) | ​ | $ | 16

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