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EMPLOYEE BENEFIT PLANS - Plan assets using fair value hierarchy (Details) - Retirement Income Plan - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
EMPLOYEE BENEFIT PLANS    
Investments Measured at Net Asset Value $ 514 $ 638
Investments at Fair Value 7,314 6,802
Cash and Cash Equivalents    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 92 202
Cash and Cash Equivalents | Quoted prices in active markets for identical assets (Level 1)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 92 202
Fixed Income Securities    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 6,708 1,979
Fixed Income Securities | Significant other observable inputs (Level 2)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 6,708 1,979
Domestic Equity Securities    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy   2,693
Domestic Equity Securities | Quoted prices in active markets for identical assets (Level 1)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy   993
Domestic Equity Securities | Significant other observable inputs (Level 2)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy   1,700
International Equity Securities    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy   1,290
International Equity Securities | Significant other observable inputs (Level 2)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy   1,290
Investment    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 6,800 6,164
Investment | Quoted prices in active markets for identical assets (Level 1)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy 92 1,195
Investment | Significant other observable inputs (Level 2)    
EMPLOYEE BENEFIT PLANS    
Total Assets in the Fair Value Hierarchy $ 6,708 $ 4,969