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EMPLOYEE BENEFIT PLANS - Pre-tax amounts recognized in other comprehensive income (Details) - Retirement Income Plan - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
EMPLOYEE BENEFIT PLANS
Net loss (gain)	$ (154,000)	$ 300,000	$ 395,000
Amortization of net loss	(98,000)	(87,000)	(81,000)
Net transition obligation (asset)	0	0	0
Settlement loss	(647,000)	0	0
Amount recognized in accumulated other comprehensive (loss) income	$ (899,000)	$ 213,000	$ 314,000

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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