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COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 13,829 | ​ | $ | (2,515) | ​ | $ | 11,314
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 13,829 | ​ | ​ | (2,515) | ​ | ​ | 11,314
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 | ​ | $ | 13,807 | ​ | $ | (2,510) | ​ | $ | 11,297
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended September 30, 2023 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (14,865) | ​ | $ | 3,123 | ​ | $ | (11,742)
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (14,865) | ​ | ​ | 3,123 | ​ | ​ | (11,742)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
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 | ​ | ​ | (14) | ​ | ​ | 3 | ​ | ​ | (11)
Total other comprehensive loss | ​ | $ | (14,879) | ​ | $ | 3,126 | ​ | $ | (11,753)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Nine Months Ended September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 10,243 | ​ | ​ | (1,761) | ​ | $ | 8,482
Reclassification adjustment for (gains) realized in income | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 0
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 10,243 | ​ | ​ | (1,761) | ​ | ​ | 8,482
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 | ​ |  | (532) | ​ | ​ | 112 | ​ |  | (420)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (138) | ​ | ​ | 29 | ​ | ​ | (109)
Total other comprehensive income | ​ | $ | 10,105 | ​ | $ | (1,732) | ​ | $ | 8,373
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Nine Months Ended September 30, 2023 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (12,535) | ​ | $ | 2,632 | ​ | $ | (9,903)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (6) | ​ | ​ | 1 | ​ | ​ | (5)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (12,541) | ​ | ​ | 2,633 | ​ | ​ | (9,908)
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 | ​ |  | (42) | ​ |  | 9 | ​ |  | (33)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (50) | ​ | ​ | 10 | ​ | ​ | (40)
Total other comprehensive loss | ​ | $ | (12,591) | ​ | $ | 2,643 | ​ | $ | (9,948)
​
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 September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (41,710) | ​ | $ | 349 | ​ | $ | (41,361)
Other comprehensive income (loss) during three months ended September 30, 2024 | ​ |  | 11,314 | ​ | ​ | (17) | ​ |  | 11,297
Balance, end of period | ​ | $ | (30,396) | ​ | $ | 332 | ​ | $ | (30,064)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2023 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (48,536) | ​ | $ | 463 | ​ | $ | (48,073)
Other comprehensive loss during three months ended September 30, 2023 | ​ |  | (11,742) | ​ |  | (11) | ​ |  | (11,753)
Balance, end of period | ​ | $ | (60,278) | ​ | $ | 452 | ​ | $ | (59,826)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | (Losses) | ​ | Unfunded | ​ | Other
​ |  | Gains |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | (Loss) Income
Nine Months Ended September 30, 2024 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (38,878) | ​ | $ | 441 | ​ | $ | (38,437)
Other comprehensive income (loss) during nine months ended September 30, 2024 | ​ |  | 8,482 | ​ | ​ | (109) | ​ |  | 8,373
Balance, end of period | ​ | $ | (30,396) | ​ | $ | 332 | ​ | $ | (30,064)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2023 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | (50,370) | ​ | $ | 492 | ​ | $ | (49,878)
Other comprehensive loss during nine months ended September 30, 2023 | ​ |  | (9,908) | ​ |  | (40) | ​ |  | (9,948)
Balance, end of period | ​ | $ | (60,278) | ​ | $ | 452 | ​ | $ | (59,826)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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