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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |
Beginning accumulated other comprehensive income |  | $ 6,740 |  |  |  | $ 3,792 | $ 6,740 | $ 3,792 |
Total other comprehensive (loss) income | $ 2,818 | (3,676) | $ 2,610 | $ 1,263 | $ 1,801 | (2,726) | (4,437) | 2,948 | $ 15,594
Ending accumulated other comprehensive income |  |  | 6,740 |  |  |  | 2,303 | 6,740 | 3,792
Net unrealized gain (loss) on AFS securities |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |
Beginning accumulated other comprehensive income |  | 10,023 |  |  |  | 5,549 | 10,023 | 5,549 | (8,663)
Other comprehensive gain (loss) before reclassifications |  |  |  |  |  |  | (5,840) | 8,628 | 14,394
Less: amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  | 2,198 | 4,154 | 182
Total other comprehensive (loss) income |  |  |  |  |  |  | (8,038) | 4,474 | 14,212
Ending accumulated other comprehensive income |  |  | 10,023 |  |  |  | 1,985 | 10,023 | 5,549
Net unrealized gain (loss) on hedging derivatives |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |
Beginning accumulated other comprehensive income |  | (1,865) |  |  |  | (600) | (1,865) | (600) | (2,249)
Other comprehensive gain (loss) before reclassifications |  |  |  |  |  |  | 2,735 | (5,200) | (770)
Less: amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |  | (3,935) | (2,419)
Total other comprehensive (loss) income |  |  |  |  |  |  | 2,735 | (1,265) | 1,649
Ending accumulated other comprehensive income |  |  | (1,865) |  |  |  | 870 | (1,865) | (600)
Net unrealized gain (loss) on post-retirement plans |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |
Beginning accumulated other comprehensive income |  | (1,418) |  |  |  | (1,157) | (1,418) | (1,157) | (890)
Other comprehensive gain (loss) before reclassifications |  |  |  |  |  |  | 866 | (261) | (267)
Total other comprehensive (loss) income |  |  |  |  |  |  | 866 | (261) | (267)
Ending accumulated other comprehensive income |  |  | (1,418) |  |  |  | (552) | (1,418) | (1,157)
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |
Beginning accumulated other comprehensive income |  | $ 6,740 |  |  |  | $ 3,792 | 6,740 | 3,792 | (11,802)
Other comprehensive gain (loss) before reclassifications |  |  |  |  |  |  | (2,239) | 3,167 | 13,357
Less: amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  | 2,198 | 219 | (2,237)
Total other comprehensive (loss) income |  |  |  |  |  |  | (4,437) | 2,948 | 15,594
Ending accumulated other comprehensive income |  |  | $ 6,740 |  |  |  | $ 2,303 | $ 6,740 | $ 3,792

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: 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=124509347&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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