DERIVATIVES (Details 2) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended	66 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 131,391	$ 199,503
Derivative liabilities	2,215	5,213
Derivative assets	0	2,365
Derivatives designated as hedging instruments | Interest rate swaps on certificates of deposit
Derivative [Line Items]
Notional amount	48,365	112,913
Derivative liabilities	2,137	5,213
Decrease in notional amount	63,700
Derivative assets	0	0
Derivatives designated as hedging instruments | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	83,026	86,590
Derivative liabilities	78	0
Derivative assets	0	2,365
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	8,122,776	7,190,926
Derivative liabilities	149,965	76,679
Derivative assets	150,358	77,469
Derivatives not designated as hedging instruments | Interest rate swaps and options
Derivative [Line Items]
Notional amount	7,450,492	6,494,900
Derivative liabilities	146,623	67,325
Notional amount of derivative assets	3,730,000	3,250,000
Notional amount of derivative liabilities	3,730,000	3,250,000
Derivative assets	144,293	67,215
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative [Line Items]
Notional amount	605,400	653,000
Derivative liabilities	3,300	9,400
Derivative assets	6,100	10,300
Derivatives not designated as hedging instruments | RPAs
Derivative [Line Items]
Notional amount	66,845	43,033
Derivative liabilities	8	4
Derivative assets	0	0
Interest rate derivative exposure	$ 278	$ 257
Weighted average remaining maturity (in years)	3 years 8 months	3 years 2 months
Derivatives not designated as hedging instruments | RPAs | Long
Derivative [Line Items]
Notional amount	$ 43,000	$ 33,700
Derivatives not designated as hedging instruments | RPAs | Short
Derivative [Line Items]
Notional amount	$ 23,900	$ 9,300
Derivatives not designated as hedging instruments | Foreign exchange options
Derivative [Line Items]
Term of contract (in years)			5 years