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DERIVATIVES - Disclosure by Type of Financial Instrument (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Document Period End Date	Sep. 30, 2019
Gross amounts of recognized liabilities	$ 148,101	$ 29,189
Derivative Liability, Fair Value, Gross Asset	(248,409)	(14,577)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		14,612
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(100,308)
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Credit Risk Derivative Liabilities, at Fair Value	300	100
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	98,562	29,189
Derivative Liability, Fair Value, Gross Asset	(196,270)	(14,577)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		14,612
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	(97,708)
Fair Value Hedges | Foreign Exchange [Member] | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	49,539	0
Derivative Liability, Fair Value, Gross Asset	(52,139)	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		$ 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ (2,600)

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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