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OPERATING LEASES (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING LEASES      
Net rent expense $ 10,132 $ 10,374 $ 10,294
Net occupancy
      
OPERATING LEASES      
Rent expense charged to operating expenses 10,053 10,286 10,195
Less sublease income (25) (74) (92)
Net rent expense 10,028 10,212 10,103
Equipment expense
      
OPERATING LEASES      
Rent expense charged to operating expenses $ 104 $ 162 $ 191
Minimum
      
OPERATING LEASES      
Period for which option to extend the lease term is available 5 years    
Maximum
      
OPERATING LEASES      
Period for which option to extend the lease term is available 15 years