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PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plan        
Components of net periodic benefit cost        
Interest cost $ 344 $ 348 $ 687 $ 696
Expected return on plan assets (439) (472) (878) (944)
Amortization of net actuarial losses 354 393 708 786
Net periodic cost 259 269 517 538
SERPs        
Components of net periodic benefit cost        
Interest cost 117 110 233 220
Amortization of net actuarial losses 12 28 25 55
Amortization of net transition obligation 4 4 8 8
Amortization of prior service cost 5 5 10 10
Net periodic cost $ 138 $ 147 $ 276 $ 293