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COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 30, 2025
COMPREHENSIVE INCOME (LOSS) |
Schedule of the components of other comprehensive income, and the related tax effects | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended June 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 2,609 | ​ | $ | (576) | ​ | $ | 2,033
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 2,609 | ​ | ​ | (576) | ​ | ​ | 2,033
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (22) | ​ |  | 5 | ​ |  | (17)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (22) | ​ | ​ | 5 | ​ | ​ | (17)
Total other comprehensive income | ​ | $ | 2,587 | ​ | $ | (571) | ​ | $ | 2,016
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended June 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (812) | ​ | $ | 173 | ​ | $ | (639)
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (812) | ​ | ​ | 173 | ​ | ​ | (639)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (20) | ​ |  | 4 | ​ |  | (16)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (20) | ​ | ​ | 4 | ​ | ​ | (16)
Total other comprehensive loss | ​ | $ | (832) | ​ | $ | 177 | ​ | $ | (655)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Six Months Ended June 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 7,778 | ​ | ​ | (1,711) | ​ | $ | 6,067
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 7,778 | ​ | ​ | (1,711) | ​ | ​ | 6,067
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | 69 | ​ | ​ | (15) | ​ | ​ | 54
Amortization of prior service cost and net actuarial gain included in net periodic benefit cost | ​ |  | (44) | ​ | ​ | 10 | ​ |  | (34)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 25 | ​ | ​ | (5) | ​ | ​ | 20
Total other comprehensive income | ​ | $ | 7,803 | ​ | $ | (1,716) | ​ | $ | 6,087
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Six Months Ended June 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (3,586) | ​ | $ | 754 | ​ | $ | (2,832)
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (3,586) | ​ | ​ | 754 | ​ | ​ | (2,832)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | 394 | ​ | ​ | (83) | ​ | ​ | 311
Amortization of prior service cost and net actuarial loss and curtailment gain included in net periodic benefit cost | ​ |  | (510) | ​ |  | 107 | ​ |  | (403)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (116) | ​ | ​ | 24 | ​ | ​ | (92)
Total other comprehensive loss | ​ | $ | (3,702) | ​ | $ | 778 | ​ | $ | (2,924)
Schedule of components of other comprehensive income and affected line item in the consolidated statements of income | ​
​ | ​ | ​
​ | ​ | Affected Line Item in the
Description |  | Consolidated Statements of Income
Amortization of prior service cost and net actuarial gain and curtailment gain included in net periodic benefit cost (before-tax) |  | Other noninterest expense
Income tax effect | ​ | Income tax provision
Schedule of changes in the components of accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | (Losses) | ​ | Unfunded | ​ | Other
​ |  | Gains |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | (Loss) Income
Three Months Ended June 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (33,050) | ​ | $ | 360 | ​ | $ | (32,690)
Other comprehensive income during three months ended June 30, 2025 | ​ |  | 2,033 | ​ | ​ | (17) | ​ |  | 2,016
Balance, end of period | ​ | $ | (31,017) | ​ | $ | 343 | ​ | $ | (30,674)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2024 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (41,071) | ​ | $ | 365 | ​ | $ | (40,706)
Other comprehensive loss during three months ended June 30, 2024 | ​ |  | (639) | ​ |  | (16) | ​ |  | (655)
Balance, end of period | ​ | $ | (41,710) | ​ | $ | 349 | ​ | $ | (41,361)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | (Losses) | ​ | Unfunded | ​ | Other
​ |  | Gains |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | (Loss) Income
Six Months Ended June 30, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (37,084) | ​ | $ | 323 | ​ | $ | (36,761)
Other comprehensive income during six months ended June 30, 2025 | ​ |  | 6,067 | ​ | ​ | 20 | ​ |  | 6,087
Balance, end of period | ​ | $ | (31,017) | ​ | $ | 343 | ​ | $ | (30,674)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2024 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (38,878) | ​ | $ | 441 | ​ | $ | (38,437)
Other comprehensive loss during six months ended June 30, 2024 | ​ |  | (2,832) | ​ |  | (92) | ​ |  | (2,924)
Balance, end of period | ​ | $ | (41,710) | ​ | $ | 349 | ​ | $ | (41,361)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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