DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Cash posted as collateral related to derivative transactions	$ 20,100,000
Cash posted as collateral related to derivative transactions	9,648,000
Securities posted as collateral related to derivative transactions	54,600,000
Cash received as collateral related to derivative transactions	2,500,000
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)	4,409,000	8,204,000
Amount of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(497,000)	(674,000)
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	368,000	646,000
Expected reclassification out of accumulated other comprehensive income (loss) into earnings during the next twelve months	600,000
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)		(73,000)
Amount of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)		(854,000)
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)	4,409,000	8,277,000
Amount of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(497,000)	180,000
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	$ 368,000	$ 646,000

Represents the total amount of cash posted as collateral on derivative transactions.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.

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The amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

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