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PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension Plan
   
Components of net periodic cost    
Interest cost $ 348 $ 398
Expected return on plan assets (470) (447)
Amortization of unrecognized (gain) loss 599 581
Net periodic cost 477 532
SERPs
   
Components of net periodic cost    
Interest cost 103 107
Amortization of unrecognized transition obligation 4 4
Amortization of prior service cost 5 5
Amortization of unrecognized (gain) loss 18 (1)
Net periodic cost $ 130 $ 115