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COMPREHENSIVE INCOME (Tables) | 3 Months Ended
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Mar. 31, 2024
COMPREHENSIVE INCOME |
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, 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 loss and curtailment 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended March 31, 2023 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 8,993 | ​ | $ | (1,888) | ​ | $ | 7,105
Reclassification adjustment for (gains) realized in income | ​ |  | (7) | ​ |  | 1 | ​ |  | (6)
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 8,986 | ​ | ​ | (1,887) | ​ | ​ | 7,099
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | (8) | ​ |  | 1 | ​ |  | (7)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (14) | ​ |  | 3 | ​ |  | (11)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (22) | ​ | ​ | 4 | ​ | ​ | (18)
Total other comprehensive income | ​ | $ | 8,964 | ​ | $ | (1,883) | ​ | $ | 7,081
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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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
Reclassification adjustment for (gains) realized in income (before-tax) | ​ | Realized gains on available-for-sale debt securities, net
Amortization of prior service cost and net actuarial loss 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, 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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2023 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (50,370) | ​ | $ | 492 | ​ | $ | (49,878)
Other comprehensive income during three months ended March 31, 2023 | ​ |  | 7,099 | ​ |  | (18) | ​ |  | 7,081
Balance, end of period | ​ | $ | (43,271) | ​ | $ | 474 | ​ | $ | (42,797)
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