DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative instruments and hedging activities
Liability position related to credit-risk-related contingent features	$ 12,200,000		$ 12,200,000
Termination value of derivatives with credit-risk-related contingent features	12,200,000		12,200,000
Interest rate swaps | Derivative in Cash Flow Hedging Relationships
Derivative instruments and hedging activities
Amount of Gain or (Loss) Recognized in Other Comprehensive Income on Derivative (Effective Portion)	(1,192,000)	(3,005,000)	(892,000)	(7,017,000)
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (Effective Portion)	$ 1,044,000	$ 1,059,000	$ 3,100,000	$ 3,131,000