DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)			3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Cash flow hedges	Jun. 30, 2012 Cash flow hedges	Jun. 30, 2013 Cash flow hedges	Jun. 30, 2012 Cash flow hedges	Jun. 30, 2012 Cash flow hedges Interest rate	Jun. 30, 2012 Cash flow hedges Interest rate	Jun. 30, 2013 Cash flow hedges Inflation	Jun. 30, 2012 Cash flow hedges Inflation	Jun. 30, 2013 Cash flow hedges Inflation	Jun. 30, 2012 Cash flow hedges Inflation
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)			$ (4,589,000)	$ (7,070,000)	$ (180,000)	$ 1,134,000	$ (2,000)	$ (75,000)	$ (4,589,000)	$ (7,068,000)	$ (180,000)	$ 1,209,000
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)			(580,000)	(971,000)	(1,077,000)	(1,645,000)	(858,000)	(1,712,000)	(580,000)	(113,000)	(1,077,000)	67,000
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)			(558,000)	(870,000)	(190,000)	(224,000)			(558,000)	(870,000)	(190,000)	(224,000)
Expected reclassification out of accumulated other comprehensive income (loss) into earnings during the next twelve months					2,300,000
Cash posted as collateral related to derivative transactions	60,300,000
Securities posted as collateral related to derivative transactions	52,300,000
Cash received as collateral related to derivative transactions	$ 1,000,000	$ 11,280,000