EMPLOYEE BENEFIT PLANS (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($) age	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Incentive plans and discretionary bonus expense	$ 16,300,000	$ 13,800,000	$ 10,900,000
Employer matching contribution percent	25.00%
Employee contribution percent	6.00%
Nondiscretionary requisite service period	1 year
Defined Contribution Plan, Nondiscretionary Requisite service hours	1,000
DefinedContributionPlanEmployerSafeHarborContributionAmount	3.00%
Nondiscretionary employer contribution, percent up to social security limit	2.00%
Nondiscretionary employer contribution, percent over social security limit	5.00%
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 142,000	142,000	143,000
Multiemployer Plans [Abstract]
Significance of contributions percentage	5.00%
Defined benefit plan expense	$ 1,400,000	1,100,000	1,900,000
Postretirement Benefits [Abstract]
Retirement age | age	65
Service period to be eligible for postretirement benefit	10 years
Death benefit	$ 5,000
Supplemental Executive Retirement Plans [Abstract]
Plan assets	18,300,000	16,600,000
401(k) Restoration Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	356,000	278,000	267,000
Employee Savings Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	6,600,000	5,400,000	5,000,000.0
Executive Vice President [Member]
Defined Contribution Plan Disclosure [Line Items]
Supplemental Unemployment Benefits, Salary Continuation	$ 295,000	287,000	$ 279,000
Other Pension Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.03%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	8.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.11%
Supplemental Executive Retirement Plans [Abstract]
Plan assets	$ 11,653,000	$ 9,697,000
Equity Securities [Member]
Supplemental Executive Retirement Plans [Abstract]
Plan assets	$ 1,131,000
Minimum [Member] | Equity Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	43.00%
Minimum [Member] | Fixed Income Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15.00%
Minimum [Member] | Other Investments [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15.00%
Maximum [Member] | Equity Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	57.00%
Maximum [Member] | Fixed Income Securities [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	25.00%
Maximum [Member] | Other Investments [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	31.00%