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EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Benefits        
Net pension expense:        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 22 23 66 70
Expected return on plan assets (34) (35) (103) (104)
Recognized net actuarial (gain) loss 33 49 99 145
Net pension expense (benefit) 21 37 62 111
SERP Benefits        
Net pension expense:        
Service cost 0 0 0 0
Interest cost 8 9 27 26
Expected return on plan assets (13) (15) (41) (46)
Recognized net actuarial (gain) loss 18 18 55 55
Net pension expense (benefit) $ 13 $ 12 $ 41 $ 35