PENSION PLANS AND OTHER POST-RETIREMENT BENEFITS - Other Non-qualified Deferred Comp Agreements (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)
Other Non-qualified Deferred Compensation Agreements
Minimum number of years benefits are payable	5 years
Minimum age at which payments under deferred compensation agreements may begin	55 years
Payment related to deferred compensation agreements	$ 200,000	$ 200,000
Net present value of the remaining obligations	$ 600,000	800,000
Number of life insurance policies | item	22
Excess of cash surrender value of remaining life insurance policies over notes payable	$ 2,700,000	2,500,000
Proceeds from life insurance policies	100,000	1,400,000
Death benefit payable	6,200,000	$ 6,300,000
New benefits accrued	$ 0