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COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2022
COMPREHENSIVE INCOME (LOSS) |
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
2022 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (69,828) | ​ | $ | 14,665 | ​ | $ | (55,163)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (20) | ​ | ​ | 4 | ​ | ​ | (16)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (69,848) | ​ | ​ | 14,669 | ​ | ​ | (55,179)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | 389 | ​ | ​ | (81) | ​ | ​ | 308
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (42) | ​ |  | 9 | ​ |  | (33)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 347 | ​ | ​ | (72) | ​ | ​ | 275
Total other comprehensive loss | ​ | $ | (69,501) | ​ | $ | 14,597 | ​ | $ | (54,904)
2021 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (8,669) | ​ | $ | 1,821 | ​ | $ | (6,848)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (24) | ​ | ​ | 5 | ​ | ​ | (19)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (8,693) | ​ | ​ | 1,826 | ​ | ​ | (6,867)
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | 140 | ​ | ​ | (29) | ​ | ​ | 111
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (17) | ​ |  | 4 | ​ |  | (13)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 123 | ​ | ​ | (25) | ​ | ​ | 98
Total other comprehensive loss | ​ | $ | (8,570) | ​ | $ | 1,801 | ​ | $ | (6,769)
2020 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 10,504 | ​ | $ | (2,205) | ​ | $ | 8,299
Reclassification adjustment for (gains) realized in income | ​ | ​ | (169) | ​ | ​ | 35 | ​ | ​ | (134)
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 10,335 | ​ | ​ | (2,170) | ​ | ​ | 8,165
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ | ​ | (49) | ​ | ​ | 11 | ​ | ​ | (38)
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (29) | ​ |  | 6 | ​ |  | (23)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (78) | ​ | ​ | 17 | ​ | ​ | (61)
Total other comprehensive income | ​ | $ | 10,257 | ​ | $ | (2,153) | ​ | $ | 8,104
​
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) |  | ​ | ​ |  | ​ | ​ |  | Accumulated
​ | ​ | Unrealized | ​ | Unfunded | ​ | Other
​ |  | (Losses) Gains |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | (Loss) Income
2022 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 4,809 | ​ | $ | 217 | ​ | $ | 5,026
Other comprehensive (loss) during year ended December 31, 2022 | ​ |  | (55,179) | ​ |  | 275 | ​ |  | (54,904)
Balance, end of period | ​ | $ | (50,370) | ​ | $ | 492 | ​ | $ | (49,878)
2021 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 11,676 | ​ | $ | 119 | ​ | $ | 11,795
Other comprehensive (loss) during year ended December 31, 2021 | ​ |  | (6,867) | ​ |  | 98 | ​ |  | (6,769)
Balance, end of period | ​ | $ | 4,809 | ​ | $ | 217 | ​ | $ | 5,026
2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 3,511 | ​ | $ | 180 | ​ | $ | 3,691
Other comprehensive income during year ended December 31, 2020 | ​ |  | 8,165 | ​ |  | (61) | ​ |  | 8,104
Balance, end of period | ​ | $ | 11,676 | ​ | $ | 119 | ​ | $ | 11,795

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