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SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
multiple
denominator
participant
Dec. 31, 2012
Dec. 31, 2011
Change in benefit obligation:        
Noncurrent liability   $ 9,436,000 $ 9,837,000  
Supplemental Executive Retirement Plan [Member]
       
Defined Benefit Plan Disclosure [Line Items]        
Number of participants   6    
Factor used to determine annual base salary   12    
Annual base salary period (in months)   24 months    
Age of participant (in years)   65 years    
Minimum period of service (in years)   20 years    
Benefit percentage, tier one (in hundredths)   50.00%    
Benefit percentage, tier two (in hundredths)   25.00%    
Benefit percentage, tier three (in hundredths)   15.00%    
Minimum period of service for prorated benefit (in years)   15 years    
Factor used to determine prorated benefit   20    
Installment period (in years)   10 years    
Benefit percentage for special participants (in hundredths)   50.00%    
Initial prior service cost for retirement plan   5,600,000    
Prior service cost expected to be amortized in next fiscal year 584,000 584,000    
Change in benefit obligation:        
Benefit obligation, beginning of year 9,436,000 9,837,000 8,423,000  
Service cost   646,000 601,000 542,000
Interest cost   343,000 371,000 385,000
Actuarial (gain) loss   1,390,000 (442,000)  
Benefit obligation, end of year   9,436,000 9,837,000 8,423,000
Fair value of plan assets   0 0  
Unfunded status of the plan, end of year   9,436,000 9,837,000  
Current liability   0 0  
Noncurrent liability   9,436,000 9,837,000  
Accumulated benefit obligation   8,000,000 8,000,000  
Components of net periodic pension cost [Abstract]        
Service cost   646,000 601,000 542,000
Interest cost   343,000 371,000 385,000
Amortization of prior service cost   584,000 584,000 584,000
Amortization of loss   92,000 44,000 16,000
Total net periodic benefit cost   1,665,000 1,600,000 1,527,000
Assumptions used to determine the year end benefit obligation [Abstract]        
Discount rate (in hundredths)   4.51% 3.49%  
Rate of compensation increases (in hundredths)   3.50% 3.50%  
Assumptions used to determine the net periodic pension cost [Abstract]        
Discount rate (in hundredths)   3.49% 4.44% 5.44%
Rate of compensation increases (in hundredths)   3.50% 3.50% 3.50%
Defined benefit plan threshold of benefit obligation at which actuarial losses are amortized (in hundredths)   10.00%    
Estimated amounts to be amortized from accumulated other comprehensive loss in next fiscal year [Abstract]        
Amortization of prior service cost (584,000) (584,000)    
Amortization of loss   0    
Total   584,000    
Benefit payments currently expected to be paid [Abstract]        
2014   0    
2015   336,000    
2016   403,000    
2017   816,000    
2018   853,000    
2019-2023   5,256,000    
Thereafter   $ 14,438,000