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STOCK-BASED COMPENSATION PLANS (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares, Outstanding at end of year 1,265,792    
Weighted Average Exercise Price, Outstanding at end of year $ 22.76    
Non-vested Stock Options [Member]
     
Shares, Outstanding at beginning of year 485,978 421,226 349,325
Number of Options, Granted 253,400 235,700 192,000
Number of Options, Vested (173,824) (145,298) (116,999)
Number of Options, Forfeited (6,625) (25,650) (3,100)
Shares, Outstanding at end of year 558,929 485,978 421,226
Weighted Average Exercise Price, Outstanding at beginning of year $ 24.46 $ 25.16 $ 25.93
Weighted Average Exercise Price, Granted $ 23.53 $ 24.21 $ 24.49
Weighted Average Exercise Price, Vested $ 25.05 $ 25.86 $ 26.33
Weighted Average Exercise Price, Forfeited $ 24.26 $ 25.62 $ 26.84
Weighted Average Exercise Price, Outstanding at end of year $ 23.86 $ 24.46 $ 25.16
Weighted Average Fair Value, Outstanding at beginning of year $ 4.70 $ 4.94 $ 5.00
Weighted Average Fair Value, Granted $ 3.68 $ 4.51 $ 4.97
Weighted Average Fair Value, Vested $ 4.73 $ 5.05 $ 5.17
Weighted Average Fair Value, Forfeited $ 4.60 $ 4.91 $ 5.00
Weighted Average Fair Value, Outstanding at end of the year $ 4.23 $ 4.70 $ 4.94