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COMPREHENSIVE (LOSS) INCOME (Tables) | 9 Months Ended
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Sep. 30, 2022
COMPREHENSIVE (LOSS) INCOME |
Schedule of the components of other comprehensive income (loss), and the related tax effects | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended September 30, 2022 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (25,880) | ​ | $ | 5,437 | ​ | $ | (20,443)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (20) | ​ | ​ | 4 | ​ | ​ | (16)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (25,900) | ​ | ​ | 5,441 | ​ | ​ | (20,459)
Unfunded pension and postretirement obligations, | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (9) | ​ |  | 1 | ​ |  | (8)
Total other comprehensive loss | ​ | $ | (25,909) | ​ | $ | 5,442 | ​ | $ | (20,467)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended September 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (3,608) | ​ | $ | 759 | ​ | $ | (2,849)
Reclassification adjustment for (gains) realized in income | ​ |  | (23) | ​ |  | 5 | ​ |  | (18)
Other comprehensive loss from available-for-sale debt securities | ​ | $ | (3,631) | ​ | $ | 764 | ​ | $ | (2,867)
Unfunded pension and postretirement obligations, | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (5) | ​ |  | 1 | ​ |  | (4)
Total other comprehensive loss | ​ | $ | (3,636) | ​ | $ | 765 | ​ | $ | (2,871)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Nine Months Ended September 30, 2022 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (77,923) | ​ | $ | 16,365 | ​ | $ | (61,558)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (21) | ​ | ​ | 4 | ​ | ​ | (17)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (77,944) | ​ | ​ | 16,369 | ​ | ​ | (61,575)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | 133 | ​ | ​ | (27) | ​ | ​ | 106
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (31) | ​ |  | 5 | ​ |  | (26)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 102 | ​ | ​ | (22) | ​ | ​ | 80
Total other comprehensive loss | ​ | $ | (77,842) | ​ | $ | 16,347 | ​ | $ | (61,495)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Nine Months Ended September 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (6,781) | ​ | $ | 1,425 | ​ | $ | (5,356)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (25) | ​ | ​ | 5 | ​ | ​ | (20)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (6,806) | ​ | ​ | 1,430 | ​ | ​ | (5,376)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | (5) | ​ | ​ | 1 | ​ | ​ | (4)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (13) | ​ |  | 3 | ​ |  | (10)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (18) | ​ | ​ | 4 | ​ | ​ | (14)
Total other comprehensive loss | ​ | $ | (6,824) | ​ | $ | 1,434 | ​ | $ | (5,390)
Schedule of components of other comprehensive income (loss) 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 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 (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  |  | ​ |  | Accumulated
​ | ​ | (Losses) | ​ | Unfunded | ​ | Other
​ | ​ | Gains | ​ | Retirement | ​ | Comprehensive
​ | ​ | on Securities | ​ | Obligations | ​ | (Loss) Income
Three Months Ended September 30, 2022 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | (36,307) | ​ | $ | 305 | ​ | $ | (36,002)
Other comprehensive loss during three months ended September 30, 2022 | ​ |  | (20,459) | ​ |  | (8) | ​ |  | (20,467)
Balance, end of period | ​ | $ | (56,766) | ​ | $ | 297 | ​ | $ | (56,469)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2021 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 9,167 | ​ | $ | 109 | ​ | $ | 9,276
Other comprehensive loss during three months ended September 30, 2021 | ​ |  | (2,867) | ​ |  | (4) | ​ |  | (2,871)
Balance, end of period | ​ | $ | 6,300 | ​ | $ | 105 | ​ | $ | 6,405
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | (Losses) | ​ | Unfunded | ​ | Other
​ |  | Gains |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | (Loss) Income
Nine Months Ended September 30, 2022 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 4,809 | ​ | $ | 217 | ​ | $ | 5,026
Other comprehensive loss during nine months ended September 30, 2022 | ​ |  | (61,575) | ​ |  | 80 | ​ |  | (61,495)
Balance, end of period | ​ | $ | (56,766) | ​ | $ | 297 | ​ | $ | (56,469)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2021 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 11,676 | ​ | $ | 119 | ​ | $ | 11,795
Other comprehensive loss during nine months ended September 30, 2021 | ​ |  | (5,376) | ​ |  | (14) | ​ |  | (5,390)
Balance, end of period | ​ | $ | 6,300 | ​ | $ | 105 | ​ | $ | 6,405

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