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COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 5,169 | ​ | $ | (1,135) | ​ | $ | 4,034
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 5,169 | ​ | ​ | (1,135) | ​ | ​ | 4,034
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 | ​ |  | (22) | ​ |  | 5 | ​ |  | (17)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 47 | ​ | ​ | (10) | ​ | ​ | 37
Total other comprehensive income | ​ | $ | 5,216 | ​ | $ | (1,145) | ​ | $ | 4,071
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended March 31, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (2,774) | ​ | $ | 581 | ​ | $ | (2,193)
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (2,774) | ​ | ​ | 581 | ​ | ​ | (2,193)
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 gain included in net periodic benefit cost | ​ |  | (490) | ​ |  | 103 | ​ |  | (387)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (96) | ​ | ​ | 20 | ​ | ​ | (76)
Total other comprehensive loss | ​ | $ | (2,870) | ​ | $ | 601 | ​ | $ | (2,269)
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 March 31, 2025 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (37,084) | ​ | $ | 323 | ​ | $ | (36,761)
Other comprehensive income during three months ended March 31, 2025 | ​ |  | 4,034 | ​ | ​ | 37 | ​ |  | 4,071
Balance, end of period | ​ | $ | (33,050) | ​ | $ | 360 | ​ | $ | (32,690)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2024 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (38,878) | ​ | $ | 441 | ​ | $ | (38,437)
Other comprehensive loss during three months ended March 31, 2024 | ​ |  | (2,193) | ​ |  | (76) | ​ |  | (2,269)
Balance, end of period | ​ | $ | (41,071) | ​ | $ | 365 | ​ | $ | (40,706)
​

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