SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN - Components of Net Periodic Pension Cost (Details) - Supplemental Executive Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Components of net periodic pension cost [Abstract]
Service cost	$ 361	$ 428
Interest cost	346	291
Amortization of prior service cost	280	275
Amortization of loss	372	1,234
Total net periodic benefit cost	$ 1,359	$ 2,228