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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 2025
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of 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, 2025 | ​ | $ | (43,767) | ​ | $ | (7,499) | ​ | $ | 6,248 | ​ | $ | (45,018)
Other comprehensive income (loss) before reclassifications | ​ |  | 6,136 | ​ |  | 3,364 | ​ |  | (5,244) | ​ |  | 4,256
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 502 | ​ |  | (60) | ​ |  | 1,275 | ​ |  | 1,717
Net other comprehensive income (loss) during the period | ​ |  | 6,638 | ​ |  | 3,304 | ​ |  | (3,969) | ​ |  | 5,973
Balance as of March 31, 2025 | ​ | $ | (37,129) | ​ | $ | (4,195) | ​ | $ | 2,279 | ​ | $ | (39,045)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2024 | ​ | $ | (90,242) | ​ | $ | (6,430) | ​ | $ | 5,093 | ​ | $ | (91,579)
Other comprehensive income before reclassifications | ​ |  | 2,360 | ​ |  | 361 | ​ |  | 1,457 | ​ |  | 4,178
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | 490 | ​ |  | (216) | ​ |  | 1,661 | ​ |  | 1,935
Net other comprehensive income during the period | ​ |  | 2,850 | ​ |  | 145 | ​ |  | 3,118 | ​ |  | 6,113
Balance as of March 31, 2024 | ​ | $ | (87,392) | ​ | $ | (6,285) | ​ | $ | 8,211 | ​ | $ | (85,466)
Schedule of before and after tax amounts allocated to each component of other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) | ​ | 2025 |  | 2024
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |
Change in net unrealized gain during the period | ​ | $ | 7,960 | ​ | $ | 3,344
Reclassification adjustment for net losses included in net loss on sale of securities and other assets | ​ |  | — | ​ |  | —
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 724 | ​ | ​ | 718
Credit loss expense | ​ | ​ | 893 | ​ | ​ | —
Net change | ​ |  | 9,577 | ​ |  | 4,062
Tax expense | ​ |  | 2,939 | ​ |  | 1,212
Net change in unrealized gain on securities, net of reclassification adjustments and tax | ​ |  | 6,638 | ​ |  | 2,850
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |
Reclassification adjustment for expense included in other expense | ​ |  | (87) | ​ |  | (317)
Change in the net actuarial gain | ​ |  | 4,854 | ​ |  | 520
Net change | ​ |  | 4,767 | ​ |  | 203
Tax expense | ​ |  | 1,463 | ​ |  | 58
Net change in pension and other postretirement obligations | ​ |  | 3,304 | ​ |  | 145
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |
Change in net unrealized (loss) gain during the period | ​ |  | (7,567) | ​ |  | 2,145
Reclassification adjustment for expense included in interest expense | ​ |  | 1,840 | ​ |  | 2,435
Net change | ​ |  | (5,727) | ​ |  | 4,580
Tax (benefit) expense | ​ |  | (1,758) | ​ |  | 1,462
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | (3,969) | ​ |  | 3,118
Other comprehensive income, net of tax | ​ | $ | 5,973 | ​ | $ | 6,113
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