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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest rate swaps | Economic hedges | Industrial revenue bond
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	$ (222)	$ 163	$ (343)	$ 474
Interest rate swaps | Economic hedges | Loans with commercial loan customers
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	42,967	(5,270)	64,956	(19,939)
(Unfavorable)/Favorable change in credit valuation adjustment recognized in other non-interest income	(1,146)	95	(1,283)	332
Reverse interest rate swaps | Economic hedges | Loans with commercial loan customers
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	(42,967)	5,270	(64,956)	19,939
Risk participation agreements with dealer banks | Economic hedges
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	(19)	7	106	23
Forward sale commitments | Economic hedges
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	108	(658)	(410)	(1,567)
Realized gain in discontinued operations	(4,083)	1,077	(5,798)	4,999
Commitments to lend | Non-hedging derivatives
Derivative [Line Items]
Unrealized (loss)/gain recognized in other non-interest income	2,687	7,285	5,078	13,816
Realized gain in discontinued operations	$ 16,281	$ 2,491	$ 25,713	$ 3,094

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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