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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
Mar. 31, 2017
Mar. 31, 2016
Components of net periodic pension cost [Abstract]    
Service cost $ 301 $ 357
Interest cost 242 231
Amortization of prior service cost 415 437
Amortization of loss 47 4
Total net periodic benefit cost $ 1,005 $ 1,029