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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2020
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) |
Schedule of other comprehensive (loss) income and related income tax effects | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Unrealized holding gains (losses) on available for sale securities | ​ | $ | 9,069 |  | $ | 15,524 |  | $ | (8,429)
Reclassification adjustments for (gains) losses realized in income | ​ |  | (3,525) |  |  | (201) |  |  | 7,921
Income tax effect | ​ | ​ | (1,628) | ​ |  | (4,467) | ​ |  | 160
Net change in unrealized gains (losses) on available for sale securities | ​ | ​ | 3,916 | ​ |  | 10,856 | ​ |  | (348)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (3,245) | ​ |  | (1,076) | ​ |  | (1,567)
Reclassification adjustments for amortization realized in income | ​ | ​ | 581 | ​ |  | 487 | ​ |  | 384
Income tax effect | ​ | ​ | 799 | ​ |  | 179 | ​ |  | 351
Net change in post-retirement obligation | ​ | ​ | (1,865) | ​ |  | (410) | ​ |  | (832)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in fair value of derivatives used for cash flow hedges | ​ | ​ | (10,455) | ​ |  | (3,601) | ​ |  | 2,493
Reclassification adjustments for losses (gains) realized in income | ​ | ​ | 5,016 | ​ |  | (1,588) | ​ |  | (1,068)
Income tax effect | ​ | ​ | 1,601 | ​ |  | 1,514 | ​ |  | (418)
Net change in unrealized (losses) gains on cash flow hedges | ​ | ​ | (3,838) | ​ |  | (3,675) | ​ |  | 1,007
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive (loss) income | ​ | $ | (1,787) |  | $ | 6,771 |  | $ | (173)
Schedule of accumulated other comprehensive (loss) income balances, net of income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | December 31, | ​ | Comprehensive | ​ | ​ | December 31,
(In thousands) |  | 2019 |  | Income (Loss) |  |  | 2020
Unrealized (losses) gains on available for sale securities | ​ | $ | (829) | ​ | $ | 3,916 | ​ | $ | 3,087
Unrealized losses on pension benefits | ​ |  | (6,775) | ​ |  | (1,865) | ​ |  | (8,640)
Unrealized losses on cash flow hedges | ​ |  | (737) | ​ |  | (3,838) | ​ |  | (4,575)
Accumulated other comprehensive loss, net of income taxes | ​ | $ | (8,341) | ​ | $ | (1,787) | ​ | $ | (10,128)
Schedule of reclassifications out of accumulated other comprehensive (loss) income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​ | Affected Line Item in the
(In thousands) |  | 2020 |  | 2019 |  | 2018 |  | Consolidated Statements of Income
Realized gains (losses) on sale of available for sale securities | ​ | $ | 3,525 | ​ | $ | 201 | ​ | $ | (7,921) |  | Net securities gains (losses)
Amortization of defined benefit pension plan and defined benefit plan component of the SERP: | ​ | ​ |  | ​ |  |  | ​ |  |  |  | ​
Prior service credit | ​ | ​ | 77 | ​ |  | 77 | ​ |  | 77 |  | Other operating expenses
Transition obligation | ​ | ​ | — | ​ |  | — | ​ |  | (5) |  | Other operating expenses
Actuarial losses | ​ | ​ | (658) | ​ |  | (564) | ​ |  | (456) |  | Other operating expenses
Realized (losses) gains on cash flow hedges | ​ | ​ | (1,651) | ​ |  | 1,588 | ​ |  | 1,068 |  | Interest expense
Realized loss on the termination of swaps | ​ | ​ | (3,365) | ​ | ​ | — | ​ | ​ | — | ​ | Loss on termination of swaps
Total reclassifications, before income tax | ​ | ​ | (2,072) | ​ | ​ | 1,302 | ​ | ​ | (7,237) |  | ​
Income tax benefit (expense) | ​ | ​ | 606 | ​ |  | (380) | ​ |  | 2,105 |  | Income tax expense
Total reclassifications, net of income tax | ​ | $ | (1,466) | ​ | $ | 922 | ​ | $ | (5,132) |  | ​

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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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