DERIVATIVES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Values of Derivative Instruments
Derivative Assets	$ 6,510	$ 12,383
Derivative liabilities	98,748	56,493
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional Amount	114,088	132,667
Derivative Assets	0	0
Derivative liabilities	3,339	9,922
Designated as Hedging Instrument | Interest rate swaps on certificates of deposit
Fair Values of Derivative Instruments
Notional Amount	114,088	132,667
Derivative Assets	0	0
Derivative liabilities	3,339	9,922
Derivative instruments not designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	6,880,627	5,672,472
Derivative Assets	96,699	55,788
Derivative liabilities	99,703	54,334
Derivative instruments not designated as hedging instruments | Foreign exchange options
Fair Values of Derivative Instruments
Notional Amount	0	85,614
Derivative Assets	0	6,136
Derivative liabilities	0	0
Derivative instruments not designated as hedging instruments | Embedded derivative liabilities
Fair Values of Derivative Instruments
Notional Amount	0	47,838
Derivative Assets	0	0
Derivative liabilities	0	3,392
Derivative instruments not designated as hedging instruments | Interest rate swaps and caps
Fair Values of Derivative Instruments
Notional Amount	6,063,494	4,858,391
Derivative Assets	86,954	41,534
Derivative liabilities	87,330	41,779
Derivative instruments not designated as hedging instruments | Foreign exchange contracts
Fair Values of Derivative Instruments
Notional Amount	817,133	680,629
Derivative Assets	9,745	8,118
Derivative liabilities	$ 12,373	$ 9,163