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COMPONENTS OF QUARTERLY AND YEAR TO DATE NET PERIODIC BENEFIT COSTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Qualified Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period $ 353 $ 271 $ 707 $ 542
Interest cost on projected benefit obligation 457 435 914 870
Expected return on plan assets (824) (793) (1,647) (1,586)
Amortization of unrecognized transition obligation 0 0 0 0
Amortization of unrecognized prior service cost 3 2 5 4
Amortization of unrecognized net loss 369 160 737 320
Net periodic benefit cost 358 75 716 150
Supplemental Pension Plan [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period 11 10 22 20
Interest cost on projected benefit obligation 12 13 24 26
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost 0 0 0 0
Amortization of unrecognized net loss 13 5 26 10
Net periodic benefit cost 36 28 72 56
Postretirement Plan, Medical and Life [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost, benefits earned during the period 12 11 24 22
Interest cost on projected benefit obligation 16 18 32 36
Expected return on plan assets 0 0 0 0
Amortization of unrecognized prior service cost (24) (24) (48) (48)
Amortization of unrecognized net loss 2 0 4 0
Net periodic benefit cost $ 6 $ 5 $ 12 $ 10