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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN - Components of Net Periodic Pension Cost (Details) - Supplemental Executive Retirement Plan [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Components of net periodic pension cost [Abstract]        
Service cost $ 273 $ 227 $ 546 $ 515
Interest cost 321 403 642 806
Amortization of prior service cost 274 399 549 798
Amortization of loss 546 410 1,091 821
Total net periodic benefit cost $ 1,414 $ 1,439 $ 2,828 $ 2,940