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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Awarded Shares of Restricted Stock Under Stock Incentive Plan (Details) - shares	12 Months Ended
	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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Number of shares issued under share-based payment arrangement.

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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

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