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PENSION PLANS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2002
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
Amortization period of increase in prior service cost       13 years
Change in benefit obligation        
Benefit obligation at the beginning of the period 34,091 33,633    
Interest cost 1,585 1,668 1,790  
Actuarial loss 2,923 1,014    
Benefits paid (2,460) (2,224)    
Benefit obligation at the end of the period 36,139 34,091 33,633  
Change in plan assets        
Fair value of assets at the beginning of the period 22,559 23,220    
Actual return on plan assets 2,235 168    
Employer contributions 1,446 1,395    
Benefits paid (2,460) (2,224)    
Fair value of assets at the end of the period 23,780 22,559 23,220  
Funded status (12,359) (11,532)    
Amounts recognized in the consolidated balance sheets        
Accrued benefit liability (12,359) (11,532)    
Components of accumulated other comprehensive income:        
Unrecognized net actuarial loss (19,205) (19,111)    
Net amount recognized 6,846 7,579    
Benefit obligation actuarial assumptions        
Weighted average discount rate (as a percent) 4.00% 4.80%    
Components of net periodic cost        
Interest cost 1,585 1,668 1,790  
Expected return on plan assets (1,791) (1,821) (1,710)  
Recognized net (gain) loss 2,385 2,263 1,962  
Net periodic cost 2,179 2,110 2,042  
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss (93) (404) (414)  
Total recognized in other comprehensive income (93) (404) (414)  
Total recognized in net periodic cost and other comprehensive income 2,272 2,514 2,456  
Net periodic cost actuarial assumptions        
Weighted average discount rate (as a percent) 4.80% 5.10% 5.90%  
Expected long-term rate of return on plan assets (as a percent) 8.00% 8.00% 8.00%  
Unrecognized net actuarial loss included in AOCI expected to be recognized in net periodic pension cost in the next fiscal year 2,400      
SERPs
        
Change in benefit obligation        
Benefit obligation at the beginning of the period 8,558 7,755    
Interest cost 426 412 435  
Actuarial loss 1,175 606    
Benefits paid (215) (215)    
Benefit obligation at the end of the period 9,944 8,558 7,755  
Change in plan assets        
Employer contributions 215 215    
Benefits paid (215) (215)    
Funded status (9,944) (8,558)    
Amounts recognized in the consolidated balance sheets        
Accrued benefit liability (9,944) (8,558)    
Components of accumulated other comprehensive income:        
Unrecognized transition obligation (181) (198)    
Unrecognized prior service cost (137) (154)    
Unrecognized net actuarial loss (1,482) (304)    
Net amount recognized (8,144) (7,902)    
Benefit obligation actuarial assumptions        
Weighted average discount rate (as a percent) 4.20% 5.00%    
Weighted average rate of compensation increase (as a percent) 5.00% 5.00%    
Components of net periodic cost        
Service cost     42  
Interest cost 426 412 435  
Amortization of unrecognized transition obligation 17 17 17  
Recognized prior service cost 18 18 17  
Recognized net (gain) loss (4) (17) (29)  
Net periodic cost 457 430 482  
Other changes in plan assets and benefit obligations recognized in other comprehensive income        
Net loss (1,179) (624) (307)  
Amortization of prior service cost 17 18 17  
Amortization of transition obligation 17 18 17  
Total recognized in other comprehensive income (1,145) (588) (273)  
Total recognized in net periodic cost and other comprehensive income 1,602 1,018 755  
Net periodic cost actuarial assumptions        
Weighted average discount rate (as a percent) 5.00% 5.00% 6.10%  
Weighted average rate of compensation increase (as a percent) 5.00% 5.00% 5.00%  
Unrecognized net actuarial loss included in AOCI expected to be recognized in net periodic pension cost in the next fiscal year $ 71