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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN - Components of Net Periodic Pension Cost (Details) - Supplemental Executive Retirement Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Components of net periodic pension cost [Abstract]        
Service cost $ 350 $ 319 $ 708 $ 548
Interest cost 207 166 437 286
Amortization of prior service cost 393 436 830 678
Amortization of loss 4   7  
Total net periodic benefit cost $ 954 $ 921 $ 1,982 $ 1,512