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EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 12,040 $ 11,078 $ 9,990
Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 12,040 11,069  
Recurring | Large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2,364 2,144  
Recurring | Mid-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 744 590  
Recurring | Small-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 765 557  
Recurring | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,499 1,009  
Recurring | Fixed-income - core plus      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 3,880 4,028  
Recurring | Intermediate duration      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,338 1,371  
Recurring | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 510 574  
Recurring | Common/collective trusts - large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 620 566  
Recurring | Cash equivalents - money market      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 320 230  
Level 1 | Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 11,420 10,503  
Level 1 | Recurring | Large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 2,364 2,144  
Level 1 | Recurring | Mid-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 744 590  
Level 1 | Recurring | Small-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 765 557  
Level 1 | Recurring | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,499 1,009  
Level 1 | Recurring | Fixed-income - core plus      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 3,880 4,028  
Level 1 | Recurring | Intermediate duration      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 1,338 1,371  
Level 1 | Recurring | Common stock      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 510 574  
Level 1 | Recurring | Cash equivalents - money market      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 320 230  
Level 2 | Recurring      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets 620 566  
Level 2 | Recurring | Common/collective trusts - large-cap      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets $ 620 $ 566