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PENSION PLANS (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Retirement Plan
      
PENSION PLANS      
Consecutive period of service considered for highest average annual salaries for calculation of benefits under the reactivated plan 60 months    
Increase in unrecognized prior service cost due to reactivation of the plan $ 5,900,000    
Amortization period of increase in prior service cost 13 years    
Change in benefit obligation      
Benefit obligation at the beginning of the year 36,139,000 34,091,000  
Interest cost 1,370,000 1,585,000 1,668,000
Actuarial (gains) losses (2,969,000) 2,923,000  
Benefits paid (2,357,000) (2,460,000)  
Benefit obligation at the end of the year 32,183,000 36,139,000 34,091,000
Change in plan assets      
Fair value of plan assets at the beginning of the year 23,780,000 22,559,000  
Actual return on plan assets 4,712,000 2,235,000  
Employer contributions 1,647,000 1,446,000  
Benefits paid (2,357,000) (2,460,000)  
Fair value of plan assets at the end of the year 27,782,000 23,780,000 22,559,000
Funded status at end of year (4,401,000) (12,359,000)  
Amounts recognized in AOCI      
Net actuarial losses (10,895,000) (19,205,000)  
Benefit obligation actuarial assumptions      
Weighted average discount rate (as a percent) 4.70% 4.00%  
Components of net periodic benefit cost      
Interest cost 1,370,000 1,585,000 1,668,000
Expected return on plan assets (1,762,000) (1,791,000) (1,821,000)
Amortization of net actuarial (gains) losses 2,390,000 2,385,000 2,263,000
Net periodic benefit cost 1,998,000 2,179,000 2,110,000
Net periodic cost actuarial assumptions      
Weighted average discount rate (as a percent) 4.00% 4.80% 5.10%
Expected long-term rate of return on plan assets (as a percent) 7.50% 8.00% 8.00%
Unrecognized net actuarial losses included in AOCI expected to be recognized in net periodic benefit cost in the next fiscal year 1,200,000    
SERP
      
Change in benefit obligation      
Benefit obligation at the beginning of the year 9,944,000 8,558,000  
Interest cost 411,000 426,000 412,000
Actuarial (gains) losses (1,033,000) 1,175,000  
Benefits paid (215,000) (215,000)  
Benefit obligation at the end of the year 9,107,000 9,944,000 8,558,000
Change in plan assets      
Employer contributions 215,000 215,000  
Benefits paid (215,000) (215,000)  
Funded status at end of year (9,107,000) (9,944,000)  
Amounts recognized in AOCI      
Net transition obligation (164,000) (181,000)  
Prior service cost (119,000) (137,000)  
Net actuarial losses (379,000) (1,482,000)  
Total amounts recognized in AOCI (662,000) (1,800,000)  
Benefit obligation actuarial assumptions      
Weighted average discount rate (as a percent) 5.00% 4.20%  
Components of net periodic benefit cost      
Interest cost 411,000 426,000 412,000
Amortization of net transition obligation 17,000 17,000 17,000
Amortization of prior service cost 18,000 18,000 18,000
Amortization of net actuarial (gains) losses 71,000 (4,000) (17,000)
Net periodic benefit cost 517,000 457,000 430,000
Net periodic cost actuarial assumptions      
Weighted average discount rate (as a percent) 4.20% 5.00% 5.00%
Unrecognized net actuarial losses included in AOCI expected to be recognized in net periodic benefit cost in the next fiscal year $ 2,000