DERIVATIVE FINANCIAL INSTRUMENTS AND BALANCE SHEET OFFSETTING (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets, Resale Agreements
Net Amounts of Assets Presented	$ 1,475,000	$ 1,300,000
Liabilities, Repurchase Agreements
Net Amounts of Liabilities Presented	805,106	995,000
Gross Amounts Not Offset in the Consolidated Balance Sheets
Cash collateral received	933
Cash collateral posted	6,500	187
Counterparties assets
Assets, Derivatives
Gross Amounts of Recognized Assets	17,556	16,043
Net Amounts of Assets Presented	17,556	16,043
Gross Amounts Not Offset
Financial Instruments	(12,812)	(11,363)
Collateral Received	(933)	(4,680)
Net Amount	3,811
Assets, Resale Agreements
Gross Amounts of Recognized Assets	1,675,000	1,400,000
Gross amounts offset	(200,000)
Net Amounts of Assets Presented	1,475,000	1,400,000
Gross Amounts Not Offset
Financial Instruments	(350,000)	(495,000)
Collateral Received	(1,092,575)	(905,000)
Net Amount	32,425
Liabilities, Repurchase Agreements
Gross amounts offset	(200,000)
Counterparties liabilities
Liabilities, Derivatives
Gross Amounts of Recognized Liabilities	42,432	33,849
Net Amounts of Liabilities Presented	42,432	33,849
Gross Amounts Not Offset
Financial Instruments	(12,812)	(11,363)
Collateral Posted	(29,607)	(22,486)
Net Amount	13
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	1,005,106	995,000
Net Amounts of Liabilities Presented	805,106	995,000
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	(350,000)	(495,000)
Collateral Posted	(455,106)	(500,000)
Net Amount	$ 0	$ 0