EMPLOYEE BENEFIT PLAN - SERP (Details) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended
	Oct. 31, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Employer contribution					$ 0	$ 0
Settlement loss			$ (4,700,000)
Unrealized gain/loss due to change in fair value of SERP liabilities		$ (153,000)		$ (186,000)	(306,000)	(918,000)
Supplemental Retirement Plan ('SERP')
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		31,183,000	32,039,000		31,183,000
Trading gains (losses), net		1,599,000		4,029,000	2,070,000	(958,000)
SERP Liabilities		30,998,000	$ 29,733,000		30,998,000
Unrealized gain/loss due to change in fair value of SERP liabilities		$ 1,703,000		$ 4,156,000	$ 2,290,000	$ (713,000)
Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
Vested balance age	59 years 6 months