DERIVATIVE FINANCIAL INSTRUMENTS AND BALANCE SHEET OFFSETTING (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	$ 1,005,316	$ 995,000
Counterparties assets
Assets, Derivatives
Gross Amounts of Recognized Assets	10,370	16,043
Net Amounts of Assets Presented	10,370	16,043
Gross Amounts Not Offset
Financial Instruments	(8,203)	(11,363)
Collateral Received	(2,167)	(4,680)
Assets, Resale Agreements
Gross Amounts of Recognized Assets	1,200,000	1,400,000
Net Amounts of Assets Presented	1,200,000	1,400,000
Gross Amounts Not Offset
Financial Instruments	(400,000)	(495,000)
Collateral Received	(800,000)	(905,000)
Counterparties liabilities
Liabilities, Derivatives
Gross Amounts of Recognized Liabilities	35,574	33,849
Net Amounts of Liabilities Presented	35,574	33,849
Gross Amounts Not Offset
Financial Instruments	(8,203)	(11,363)
Collateral Posted	(27,371)	(22,486)
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	1,005,000	995,000
Net Amounts of Liabilities Presented	1,005,000	995,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets
Financial Instruments	(400,000)	(495,000)
Collateral Posted	$ (605,000)	$ (500,000)