DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional Amount	$ 129,096		$ 132,667
Derivative Liabilities	6,370	[1]	9,922	[1]
Designated as Hedging Instrument | Interest rate swaps on certificates of deposits
Fair Values of Derivative Instruments
Notional Amount	129,096		132,667
Derivative Liabilities	6,370	[1]	9,922	[1]
Derivative instruments not designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	6,340,521		5,672,472
Derivative Assets	83,083	[1]	55,793	[1]
Derivative Liabilities	83,406	[1]	54,342	[1]
Derivative instruments not designated as hedging instruments | Foreign exchange options
Fair Values of Derivative Instruments
Notional Amount	50,000		85,614
Derivative Assets	3,683	[1]	6,136	[1]
Derivative instruments not designated as hedging instruments | Embedded derivative liabilities
Fair Values of Derivative Instruments
Notional Amount	47,794		47,838
Derivative Liabilities	3,412	[1]	3,392	[1]
Derivative instruments not designated as hedging instruments | Interest rate swaps and caps
Fair Values of Derivative Instruments
Notional Amount	5,204,760		4,858,391
Derivative Assets	66,060	[1]	41,534	[1]
Derivative Liabilities	66,914	[1]	41,779	[1]
Derivative instruments not designated as hedging instruments | Foreign exchange contracts
Fair Values of Derivative Instruments
Notional Amount	1,037,967		680,629
Derivative Assets	13,340	[1]	8,123	[1]
Derivative Liabilities	$ 13,080	[1]	$ 9,171	[1]

[1] Derivative assets are included in Other Assets. Derivative liabilities are included in Accrued Expenses and Other liabilities, and Deposits.