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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables) | 9 Months Ended
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Sep. 30, 2020
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME |
Schedule of other comprehensive income (loss) and related income tax effects | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
(In thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Unrealized holding (losses) gains on available for sale securities | ​ | $ | (935) |  | $ | 2,227 | ​ | $ | 9,186 |  | $ | 16,247
Reclassification adjustments for gains realized in income | ​ |  | (3,540) |  |  | — | ​ |  | (3,525) |  |  | (201)
Income tax effect | ​ | ​ | 1,309 | ​ |  | (649) | ​ | ​ | (1,655) | ​ |  | (4,679)
Net change in unrealized (losses) gains on available for sale securities | ​ | ​ | (3,166) | ​ |  | 1,578 | ​ | ​ | 4,006 | ​ |  | 11,367
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Reclassification adjustments for amortization realized in income | ​ | ​ | 136 | ​ |  | 128 | ​ | ​ | 412 | ​ |  | 385
Income tax effect | ​ | ​ | (39) | ​ |  | (37) | ​ | ​ | (120) | ​ |  | (113)
Net change in post-retirement obligation | ​ | ​ | 97 | ​ |  | 91 | ​ | ​ | 292 | ​ |  | 272
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in fair value of derivatives used for cash flow hedges | ​ | ​ | 3,364 | ​ |  | (657) | ​ | ​ | (7,709) | ​ |  | (5,360)
Reclassification adjustments for losses (gains) realized in income | ​ | ​ | 992 | ​ |  | (331) | ​ | ​ | 1,058 | ​ |  | (1,353)
Income tax effect | ​ | ​ | (1,274) | ​ |  | 288 | ​ | ​ | 1,945 | ​ |  | 1,958
Net change in unrealized gains (losses) on cash flow hedges | ​ | ​ | 3,082 | ​ |  | (700) | ​ | ​ | (4,706) | ​ |  | (4,755)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other comprehensive income (loss) | ​ | $ | 13 |  | $ | 969 | ​ | $ | (408) |  | $ | 6,884
Schedule of accumulated other comprehensive loss balances, net of income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Other | ​ | ​ | ​
​ | ​ | December 31, | ​ | Comprehensive | ​ | ​ | September 30,
(In thousands) |  | 2019 |  | Income |  |  | 2020
Unrealized (losses) gains on available for sale securities | ​ | $ | (829) | ​ | $ | 4,006 | ​ | $ | 3,177
Unrealized (losses) gains on pension benefits | ​ |  | (6,775) | ​ |  | 292 | ​ |  | (6,483)
Unrealized losses on cash flow hedges | ​ |  | (737) | ​ |  | (4,706) | ​ |  | (5,443)
Accumulated other comprehensive loss, net of income taxes | ​ | $ | (8,341) | ​ | $ | (408) | ​ | $ | (8,749)
Schedule of reclassifications out of accumulated other comprehensive (loss) income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​ | ​ | Affected Line Item
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | ​ | in the Consolidated
(In thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  |  | Statements of Income
Realized gains on sale of available for sale securities | ​ | $ | 3,540 | ​ | $ | — | ​ | $ | 3,525 | ​ | $ | 201 | ​ |  | Net securities gains
Amortization of defined benefit pension plan and defined benefit plan component of the SERP: | ​ | ​ | ​ | ​ |  |  | ​ | ​ |  | ​ |  |  | ​ |  | ​
Prior service credit | ​ | ​ | 20 | ​ |  | 20 | ​ | ​ | 58 | ​ |  | 58 | ​ |  | Other operating expenses
Actuarial losses | ​ | ​ | (156) | ​ |  | (148) | ​ | ​ | (470) | ​ |  | (443) | ​ |  | Other operating expenses
Realized (losses) gains on cash flow hedges | ​ | ​ | (992) | ​ |  | 331 | ​ | ​ | (1,058) | ​ |  | 1,353 | ​ |  | Interest expense
Realized loss on the termination of swaps | ​ | ​ | (3,348) | ​ | ​ | — | ​ | ​ | (3,348) | ​ | ​ | — | ​ | ​ | Loss on termination of swaps
Total reclassifications, before income tax | ​ | $ | (936) | ​ | $ | 203 | ​ | $ | (1,293) | ​ | $ | 1,169 | ​ |  | ​
Income tax benefit (expense) | ​ | ​ | 274 | ​ |  | (59) | ​ | ​ | 378 | ​ |  | (341) | ​ |  | Income tax expense
Total reclassifications, net of income tax | ​ | $ | (662) | ​ | $ | 144 | ​ | $ | (915) | ​ | $ | 828 | ​ |  | ​

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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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