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COMPREHENSIVE INCOME (Tables) | 6 Months Ended
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Jun. 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 June 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 2,941 | ​ | $ | (619) | ​ | $ | 2,322
Reclassification adjustment for (gains) realized in income | ​ | ​ | (2) | ​ | ​ | 0 | ​ | ​ | (2)
Other comprehensive income from available-for-sale debt securities | ​ | ​ | 2,939 | ​ | ​ | (619) | ​ | ​ | 2,320
Unfunded pension and postretirement obligations, | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (4) | ​ |  | 1 | ​ |  | (3)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (4) | ​ | ​ | 1 | ​ | ​ | (3)
Total other comprehensive income | ​ | $ | 2,935 | ​ | $ | (618) | ​ | $ | 2,317
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended June 30, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 2,835 | ​ | $ | (593) | ​ | $ | 2,242
Unfunded pension and postretirement obligations, | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost | ​ |  | (6) | ​ |  | 1 | ​ |  | (5)
Total other comprehensive income | ​ | $ | 2,829 | ​ | $ | (592) | ​ | $ | 2,237
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Six Months Ended June 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (3,173) | ​ | $ | 666 | ​ | $ | (2,507)
Reclassification adjustment for (gains) realized in income | ​ | ​ | (2) | ​ | ​ | 0 | ​ | ​ | (2)
Other comprehensive loss from available-for-sale debt securities | ​ | ​ | (3,175) | ​ | ​ | 666 | ​ | ​ | (2,509)
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 | ​ |  | (8) | ​ |  | 2 | ​ |  | (6)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (13) | ​ | ​ | 3 | ​ | ​ | (10)
Total other comprehensive loss | ​ | $ | (3,188) | ​ | $ | 669 | ​ | $ | (2,519)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Six Months Ended June 30, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Available-for-sale debt securities, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 10,075 | ​ | $ | (2,114) | ​ | $ | 7,961
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 | ​ |  | (14) | ​ |  | 3 | ​ |  | (11)
Other comprehensive income on unfunded retirement obligations | ​ |  | 74 | ​ |  | (15) | ​ |  | 59
Total other comprehensive income | ​ | $ | 10,149 | ​ | $ | (2,129) | ​ | $ | 8,020
​
Schedule 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 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
​ | ​ | Gains | ​ | Retirement | ​ | Comprehensive
​ | ​ | on Securities | ​ | Obligations | ​ | Income
Three Months Ended June 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 6,847 | ​ | $ | 112 | ​ | $ | 6,959
Other comprehensive income during three months ended June 30, 2021 | ​ |  | 2,320 | ​ |  | (3) | ​ |  | 2,317
Balance, end of period | ​ | $ | 9,167 | ​ | $ | 109 | ​ | $ | 9,276
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 9,230 | ​ | $ | 244 | ​ | $ | 9,474
Other comprehensive income during three months ended June 30, 2020 | ​ |  | 2,242 | ​ |  | (5) | ​ |  | 2,237
Balance, end of period | ​ | $ | 11,472 | ​ | $ | 239 | ​ | $ | 11,711
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Unrealized |  | ​ |  | Accumulated
​ | ​ | Gains | ​ | Unfunded | ​ | Other
​ |  | (Losses) |  | Retirement |  | Comprehensive
​ |  | on Securities |  | Obligations |  | Income (Loss)
Six Months Ended June 30, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 11,676 | ​ | $ | 119 | ​ | $ | 11,795
Other comprehensive loss during six months ended June 30, 2021 | ​ |  | (2,509) | ​ |  | (10) | ​ |  | (2,519)
Balance, end of period | ​ | $ | 9,167 | ​ | $ | 109 | ​ | $ | 9,276
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 3,511 | ​ | $ | 180 | ​ | $ | 3,691
Other comprehensive income during six months ended June 30, 2020 | ​ |  | 7,961 | ​ |  | 59 | ​ |  | 8,020
Balance, end of period | ​ | $ | 11,472 | ​ | $ | 239 | ​ | $ | 11,711

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