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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (Tables)
3 Months Ended
Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of net periodic pension cost
The components of net periodic pension cost were as follows (in thousands):
 
 
Three Months Ended March 31,
 
 
2016
 
2015
Service cost
 
$
357

 
$
229

Interest cost
 
231

 
120

Amortization of prior service cost
 
437

 
243

Amortization of loss
 
4

 

Total net periodic benefit cost
 
$
1,029

 
$
592