EMPLOYEE BENEFIT PLAN - SERP (Details) - Supplemental Retirement Plan ('SERP') - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 23,491,000		$ 28,476,000
Unrealized (losses) gains, net	$ (4,987,000)	$ 2,852,000