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PENSION PLANS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension Plan
       
Components of net periodic benefit cost        
Interest cost $ 398 $ 417 $ 796 $ 834
Expected return on assets (447) (457) (894) (914)
Amortization of unrecognized (gain) loss 581 550 1,162 1,100
Net periodic cost 532 510 1,064 1,020
SERPs
       
Components of net periodic benefit cost        
Interest cost 107 103 214 206
Amortization of unrecognized transition obligation 4 4 8 8
Amortization of prior service cost 5 5 10 10
Amortization of unrecognized (gain) loss (1) (4) (2) (8)
Net periodic cost $ 115 $ 108 $ 230 $ 216