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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details) (USD $)
 1 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Aug. 31, 2012
Interest rate swaps
Derivatives designated as hedging instruments
item
Sep. 30, 2012
Interest rate swaps
Derivatives designated as hedging instruments
Dec. 31, 2011
Interest rate swaps
Derivatives designated as hedging instruments
Sep. 30, 2012
Interest rate swaps effective on September 20, 2014
Derivatives designated as hedging instruments
Sep. 30, 2012
Interest rate swaps effective on June 30, 2017
Derivatives designated as hedging instruments
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES              
Total outstanding notional amount of cash flow hedges $ 143,000,000            
Derivative instruments and hedging activities              
Fair Value, liability derivatives 12,229,000 11,337,000   12,229,000 11,337,000    
Additional forward-starting interest rate swaps     2        
Notional amount of interest rate cash flow hedge derivative acquired           20,000,000 100,000,000
Expanded notional amount of interest rate cash flow hedge derivative           130,000,000  
Amount to be reclassified from AOCI to interest expense in next 12 months $ 4,100,000