RETIREMENT PLANS- Schedule of net period benefit cost and other amounts recognized in OCI (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Aug. 31, 2021 USD ($)	Jan. 01, 2019 participant
Amortization:
Number of remaining retired participants in health plan | participant						10
Loss on pension withdrawal					$ 9,200
SERP and DRP
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 38	$ 24	$ 113	$ 66
Interest cost	19	21	56	76
Prior Service Cost	17	17	51	51
Amortization:
Net loss (gain)	36	32	106	(135)
Net periodic benefit cost	110	94	326	58
Post Retirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	10	12	29	41
Amortization:
Net loss (gain)	(1)	0	(2)	(111)
Net periodic benefit cost	$ 9	$ 12	$ 28	$ (69)