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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 9 Months Ended
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Sep. 30, 2023
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 3.ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Activity in accumulated other comprehensive (loss) income, net of tax, was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
Balance as of January 1, 2023 | ​ | $ | (100,870) | ​ | $ | (5,266) | ​ | $ | 11,757 | ​ | $ | (94,379)
Other comprehensive (loss) income before reclassifications | ​ |  | (15,338) | ​ |  | 952 | ​ |  | (229) | ​ |  | (14,615)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 2,666 | ​ |  | (781) | ​ |  | 196 | ​ |  | 2,081
Net other comprehensive (loss) income during the period | ​ |  | (12,672) | ​ |  | 171 | ​ |  | (33) | ​ |  | (12,534)
Balance as of September 30, 2023 | ​ | $ | (113,542) | ​ | $ | (5,095) | ​ | $ | 11,724 | ​ | $ | (106,913)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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)
​ The before and after tax amounts allocated to each component of other comprehensive (loss) income are presented in the table below for the periods indicated. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2023 |  | 2022 | ​ | 2023 |  | 2022
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized loss during the period | ​ | $ | (4,374) | ​ | $ | (39,692) | ​ | $ | (17,967) | ​ | $ | (142,980)
Reclassification adjustment for net losses included in net loss on sale of securities and other assets | ​ |  | — | ​ |  | — | ​ |  | 1,447 | ​ |  | —
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 788 | ​ |  | 1,112 | ​ | ​ | 2,341 | ​ | ​ | 2,111
Net change | ​ |  | (3,586) | ​ |  | (38,580) | ​ |  | (14,179) | ​ |  | (140,869)
Tax benefit | ​ |  | (1,062) | ​ |  | (12,133) | ​ |  | (1,507) | ​ |  | (44,304)
Net change in unrealized loss on securities, net of reclassification adjustments and tax | ​ |  | (2,524) | ​ |  | (26,447) | ​ |  | (12,672) | ​ |  | (96,565)
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (370) | ​ |  | (935) | ​ |  | (1,110) | ​ |  | (2,805)
Change in the net actuarial gain | ​ |  | 518 | ​ |  | 997 | ​ |  | 1,553 | ​ |  | 2,992
Net change | ​ |  | 148 | ​ | ​ | 62 | ​ |  | 443 | ​ |  | 187
Tax expense | ​ |  | 185 | ​ |  | 20 | ​ |  | 272 | ​ |  | 59
Net change in pension and other postretirement obligations | ​ |  | (37) | ​ |  | 42 | ​ |  | 171 | ​ |  | 128
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Change in net unrealized (loss) gain during the period | ​ |  | (246) | ​ |  | 5,387 | ​ |  | (771) | ​ |  | 14,548
Reclassification adjustment for expense included in interest expense | ​ |  | 293 | ​ |  | (546) | ​ |  | 279 | ​ |  | (569)
Net change | ​ |  | 47 | ​ |  | 4,841 | ​ |  | (492) | ​ |  | 13,979
Tax expense (benefit) | ​ |  | 14 | ​ |  | 1,522 | ​ |  | (459) | ​ |  | 4,397
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 33 | ​ |  | 3,319 | ​ |  | (33) | ​ |  | 9,582
Other comprehensive loss, net of tax | ​ | $ | (2,528) | ​ | $ | (23,086) | ​ | $ | (12,534) | ​ | $ | (86,855)
​

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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