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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Awarded Shares of Restricted Stock Under Stock Incentive Plan (Details) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Restricted Stock | Independent Directors Stock Incentive Plan | Director |  |
STOCK-BASED COMPENSATION PLANS |  |
Shares awarded (in shares) | 7,580 | 7,620
Restricted Stock | Stock Incentive Plan |  |
STOCK-BASED COMPENSATION PLANS |  |
Shares awarded (in shares) | 70,940 | 48,137
Restricted Stock | Stock Incentive Plan | Employees [Member] |  |
STOCK-BASED COMPENSATION PLANS |  |
Shares awarded (in shares) | 45,457 | 26,827
Performance Shares | Stock Incentive Plan | Employees [Member] |  |
STOCK-BASED COMPENSATION PLANS |  |
Shares awarded (in shares) | 17,903 | 13,690

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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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