COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Qualified Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	$ 296	$ 354
Interest cost on projected benefit obligation	470	457
Expected return on plan assets	(755)	(823)
Amortization of unrecognized transition obligation	0	0
Amortization of unrecognized prior service cost	2	2
Amortization of unrecognized net loss	384	368
Net periodic pension cost	397	358
Supplemental Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	11	11
Interest cost on projected benefit obligation	13	12
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	6	13
Net periodic pension cost	30	36
Postretirement Plan, Medical and Life [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	12	12
Interest cost on projected benefit obligation	17	16
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	(24)	(24)
Amortization of unrecognized net loss	6	2
Net periodic pension cost	$ 11	$ 6