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EMPLOYEE BENEFIT PLANS - Included in AOCI (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Supplemental Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial (gain) loss | $ 40 | $ 64
Postretirement Health Benefit Plan |  |
Pre-tax amounts included in accumulated other comprehensive loss that have not yet been recognized in net periodic benefit cost |  |
Unrecognized net actuarial (gain) loss | $ (5,642) | $ (4,454)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 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=124509347&loc=SL7669686-108580 + Details
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