COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Qualified Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	$ 354	$ 271
Interest cost on projected benefit obligation	457	435
Expected return on plan assets	(823)	(793)
Amortization of unrecognized transition obligation	0	0
Amortization of unrecognized prior service cost	2	2
Amortization of unrecognized net loss	368	160
Net periodic benefit cost	358	75
Supplemental Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	11	10
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	13	5
Net periodic benefit cost	36	28
Postretirement Plan, Medical and Life [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost, benefits earned during the period	12	11
Interest cost on projected benefit obligation	16	18
Expected return on plan assets	0	0
Amortization of unrecognized prior service cost	(24)	(24)
Amortization of unrecognized net loss	2	0
Net periodic benefit cost	$ 6	$ 5