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COMPREHENSIVE INCOME (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Other comprehensive loss from available-for-sale debt securities, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding losses on available-for-sale debt securities | ​ | $ | (6,114) | ​ | $ | 1,285 | ​ | $ | (4,829)
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 | ​ |  | (4) | ​ |  | 1 | ​ |  | (3)
Other comprehensive loss on unfunded retirement obligations | ​ | ​ | (9) | ​ | ​ | 2 | ​ | ​ | (7)
Total other comprehensive loss | ​ | $ | (6,123) | ​ | $ | 1,287 | ​ | $ | (4,836)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | Before-Tax |  | Income Tax |  | Net-of-Tax
​ | ​ | Amount | ​ | Effect | ​ | Amount
Three Months Ended March 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |
Other comprehensive income from available-for-sale debt securities, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized holding gains on available-for-sale debt securities | ​ | $ | 7,240 | ​ | $ | (1,521) | ​ | $ | 5,719
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 | ​ |  | (8) | ​ |  | 2 | ​ |  | (6)
Other comprehensive income on unfunded retirement obligations | ​ | ​ | 80 | ​ | ​ | (16) | ​ | ​ | 64
Total other comprehensive income | ​ | $ | 7,320 | ​ | $ | (1,537) | ​ | $ | 5,783
​
Schedule components of other comprehensive income and affected line item in the consolidated statements of income | The amounts shown in the table immediately above are included in the following line items in the consolidated statements of income:
​ | ​ | ​
​ | ​ | Affected Line Item in the
Description |  | Consolidated Statements of Income
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
​ | ​ | Gains | ​ | Unfunded | ​ | Other
​ | ​ | (Losses) | ​ | Retirement | ​ | Comprehensive
​ | ​ | on Securities | ​ | Obligations | ​ | Income
Three Months Ended March 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |
Balance, beginning of period | ​ | $ | 11,676 | ​ | $ | 119 | ​ | $ | 11,795
Other comprehensive loss during three months ended March 31, 2021 | ​ |  | (4,829) | ​ |  | (7) | ​ |  | (4,836)
Balance, end of period | ​ | $ | 6,847 | ​ | $ | 112 | ​ | $ | 6,959
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended March 31, 2020 | ​ |  |  | ​ |  |  | ​ |  |
Balance, beginning of period | ​ | $ | 3,511 | ​ | $ | 180 | ​ | $ | 3,691
Other comprehensive income during three months ended March 31, 2020 | ​ |  | 5,719 | ​ |  | 64 | ​ |  | 5,783
Balance, end of period | ​ | $ | 9,230 | ​ | $ | 244 | ​ | $ | 9,474

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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