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RETIREMENT PLANS (Details) - USD ($)
12 Months Ended
May 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2019
Defined Contribution Plan Disclosure [Line Items]          
Employer's contribution, discretionary amount   $ 0 $ 0 $ 0  
Employer's matching contribution, percentage   50.00%      
Employee's contribution, percentage of gross pay   6.00%      
Employer's matching contribution, percentage of employee compensation   50.00%      
Total expense recorded   $ 1,700,000 1,800,000 1,200,000  
Director | Deferred Compensation Arrangement          
Defined Contribution Plan Disclosure [Line Items]          
Employer's matching contribution, percentage 25.00%        
Deferred Compensation Arrangements [Abstract]          
Deferred compensation arrangement, compensation expense   845,000 754,000 659,000  
Deferred compensation arrangement, distributions   122,000 356,000 100,000  
Former Chief Executive Officer | Deferred Compensation Arrangement          
Deferred Compensation Arrangements [Abstract]          
Deferred compensation arrangement, accrued liability     282,000 $ 210,000  
Deferred compensation arrangement, supplement retirement paid   298,000      
Deferred compensation arrangement, supplement retirement payments in 2020   238,400      
Deferred compensation arrangement, supplement retirement payments in 2021   178,800      
Other Postretirement Benefit Plan [Member]          
Deferred Compensation Arrangements [Abstract]          
Funded status of the plan (market value of assets divided by funding target)         119.55%
Defined benefit plan, minimum required contribution, administrative expense   128,000 122,000    
Other liabilities. | Director | Deferred Compensation Arrangement          
Deferred Compensation Arrangements [Abstract]          
Deferred compensation arrangement, accrued liability   $ 5,000,000.0 $ 4,200,000    
Minimum          
Defined Contribution Plan Disclosure [Line Items]          
Employee's contribution, percentage of gross pay   1.00%      
Maximum          
Defined Contribution Plan Disclosure [Line Items]          
Employee's contribution, percentage of gross pay   100.00%