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EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - Retirement Income Plan - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost for benefits earned during the period $ 0 $ 0 $ 0
Interest cost on projected benefit obligation 251 266 274
Expected return on plan assets (501) (415) (406)
Amortization of net loss 81 91 84
Net periodic benefit, Total $ (169) $ (58) $ (48)