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PENSION AND OTHER POSTRETIREMENT PLANS - Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Amounts recognized in accumulated other comprehensive income |  |
Net amount recognized | $ 8,640 | $ 6,775
Pension Benefits |  |
Amounts recognized in accumulated other comprehensive income |  |
Net actuarial loss | 10,572 | 7,997
Prior service cost | (408) | (484)
Net amount recognized | 10,164 | 7,513
SERP Benefits |  |
Amounts recognized in accumulated other comprehensive income |  |
Net actuarial loss | 2,083 | 2,071
Prior service cost | 0 | 0
Net amount recognized | $ 2,083 | $ 2,071

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- Definition Amount, after 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://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 2: 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=118255775&loc=d3e1928-114920 + Details
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