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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, 2019	Dec. 31, 2018	Dec. 31, 2017
EMPLOYEE BENEFIT PLANS
Net loss (gain)	$ 300,000	$ 395,000	$ (243,000)
Amortization of net loss	(87,000)	(81,000)	(91,000)
Net transition obligation (asset)	0	0	0
Amount recognized in accumulated other comprehensive income	$ 213,000	$ 314,000	$ (334,000)

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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