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PENSION PLANS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension Plan
       
Components of net periodic benefit cost        
Interest cost $ 398 $ 417 $ 1,194 $ 1,251
Expected return on assets (447) (457) (1,341) (1,371)
Amortization of unrecognized (gain) loss 581 550 1,743 1,650
Net periodic cost 532 510 1,596 1,530
SERPs
       
Components of net periodic benefit cost        
Interest cost 107 103 321 309
Amortization of unrecognized transition obligation 4 4 12 12
Amortization of prior service cost 5 5 15 15
Amortization of unrecognized (gain) loss (1) (4) (3) (12)
Net periodic cost $ 115 $ 108 $ 345 $ 324