RETIREMENT PLANS - Supplemental employee retirement plan defined benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Net loss (gain) during the period	$ (5,323)	$ (5,883)	$ 3,188
Amortization of prior service cost		(1)	(1)
Amortization of unrecognized (gain) loss	(1,259)	(2,072)	(1,967)
Total recognized in other comprehensive income (loss)	(6,582)	(7,956)	1,220
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Net loss (gain) during the period	(1,604)	54	1,459
Amortization of prior service cost	0	0	0
Amortization of unrecognized (gain) loss	(418)	(441)	(246)
Total recognized in other comprehensive income (loss)	$ (2,022)	$ (387)	$ 1,213