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EMPLOYEE BENEFIT PLAN - SERP (Details) - USD ($)	3 Months Ended
EMPLOYEE BENEFIT PLAN - SERP (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 0		$ 0
Settlement loss		$ (4,700,000)
Supplemental Retirement Plan ('SERP')
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29,600,000	$ 32,000,000.0
Trading gains (losses), net	$ 471,000		$ (4,987,000)

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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