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PENSION AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLANS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Pension Plan
       
Components of net periodic cost        
Interest cost $ 348 $ 398 $ 1,044 $ 1,194
Expected return on plan assets (470) (447) (1,410) (1,341)
Amortization of unrecognized (gain) loss 599 581 1,797 1,743
Net periodic cost 477 532 1,431 1,596
SERPs
       
Components of net periodic cost        
Interest cost 103 107 309 321
Amortization of unrecognized transition obligation 4 4 12 12
Amortization of prior service cost 5 5 15 15
Amortization of unrecognized (gain) loss 18 (1) 54 (3)
Net periodic cost $ 130 $ 115 $ 390 $ 345