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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Qualified Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period $ 354 $ 271 $ 1,061 $ 813
Interest cost on projected benefit obligation 457 435 1,371 1,305
Expected return on plan assets (824) (793) (2,471) (2,379)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 2 2 7 6
Amortization of unrecognized net loss 369 160 1,106 480
Net periodic pension cost 358 75 1,074 225
Supplemental Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period 11 10 33 30
Interest cost on projected benefit obligation 13 14 37 40
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 12 9 38 19
Net periodic pension cost 36 33 108 89
Postretirement Plan, Medical and Life [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period 11 11 35 33
Interest cost on projected benefit obligation 16 18 48 54
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (24) (24) (72) (72)
Amortization of unrecognized net loss 3 0 7 0
Net periodic pension cost $ 6 $ 5 $ 18 $ 15