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COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2021
COMPREHENSIVE 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, 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
Three Months Ended September 30, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (95) | ​ | $ | 19 | ​ | $ | (76)
Reclassification adjustment for (gains) realized in income | ​ |  | (25) | ​ |  | 5 | ​ |  | (20)
Other comprehensive loss from available-for-sale debt securities | ​ |  | (120) | ​ |  | 24 | ​ |  | (96)
Unfunded pension and postretirement obligations, | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (8) | ​ |  | 2 | ​ |  | (6)
Total other comprehensive loss | ​ | $ | (128) | ​ | $ | 26 | ​ | $ | (102)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Nine Months Ended September 30, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 9,980 | ​ | $ | (2,095) | ​ | $ | 7,885
Reclassification adjustment for (gains) realized in income | ​ | ​ | (25) | ​ | ​ | 5 | ​ | ​ | (20)
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 9,955 | ​ | ​ | (2,090) | ​ | ​ | 7,865
Unfunded pension and postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |
Changes from plan amendments and actuarial gains and losses | ​ |  | 88 | ​ |  | (18) | ​ |  | 70
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (22) | ​ |  | 5 | ​ |  | (17)
Other comprehensive income on unfunded retirement obligations | ​ |  | 66 | ​ |  | (13) | ​ |  | 53
Total other comprehensive income | ​ | $ | 10,021 | ​ | $ | (2,103) | ​ | $ | 7,918
​
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 | ​ | Retirement | ​ | Comprehensive
​ | ​ | on Securities | ​ | Obligations | ​ | Income
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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 11,472 | ​ | $ | 239 | ​ | $ | 11,711
Other comprehensive loss during three months ended September 30, 2020 | ​ |  | (96) | ​ |  | (6) | ​ |  | (102)
Balance, end of period | ​ | $ | 11,376 | ​ | $ | 233 | ​ | $ | 11,609
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | Gains | ​ | Unfunded | ​ | Other
​ |  | (Losses) |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | Income
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
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 3,511 | ​ | $ | 180 | ​ | $ | 3,691
Other comprehensive income during nine months ended September 30, 2020 | ​ |  | 7,865 | ​ |  | 53 | ​ |  | 7,918
Balance, end of period | ​ | $ | 11,376 | ​ | $ | 233 | ​ | $ | 11,609

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