DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Cash posted as collateral related to derivative transactions	$ 102,300,000
Securities posted as collateral related to derivative transactions	51,000,000
Cash received as collateral related to derivative transactions	10,700,000	11,280,000
Cash flow hedges
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	1,130,000	3,166,000
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(2,349,000)	(3,199,000)
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	(190,000)	(177,000)
Expected reclassification out of accumulated other comprehensive income (loss) into earnings during the next twelve months	1,300,000
Cash flow hedges | Interest rate
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)		(77,000)
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)		(2,261,000)
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)	1,130,000	3,243,000
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(2,349,000)	(938,000)
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	$ (190,000)	$ (177,000)