COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Qualified Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	$ 0	$ 296
Interest cost on projected benefit obligation	403	470
Expected return on plan assets	(785)	(755)
Amortization of unrecognized transition obligation	0	0
Amortization of unrecognized prior service cost	0	2
Amortization of unrecognized net loss	58	384
Net periodic pension cost	(324)	397
Supplemental Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	0	11
Interest cost on projected benefit obligation	12	13
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	0	0
Amortization of unrecognized net loss	1	6
Net periodic pension cost	13	30
Postretirement Plan, Medical and Life
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	0	12
Interest cost on projected benefit obligation	4	17
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	(55)	(24)
Amortization of unrecognized net loss	29	6
Net periodic pension cost	$ (22)	$ 11