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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Hedging derivatives | Economic Hedging | Interest Rate Swap | Industrial Revenue Bond
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	$ (248)	$ 409	$ 371
Hedging derivatives | Economic Hedging | Interest Rate Swap | Commercial loan
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	65,098	8,758	(3,557)
Hedging derivatives | Economic Hedging | Reverse Interest Rate Swaps | Commercial loan
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	(65,098)	(8,758)	3,557
(Unfavorable)/Favorable change in credit valuation adjustment recognized in other non-interest income	(1,214)	(519)	(316)
Hedging derivatives | Economic Hedging | Risk Participation Agreements
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	83	263	(31)
Hedging derivatives | Economic Hedging | Forward Commitments
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	507	(611)	(123)
Realized (loss) in discontinued operations	(9,195)	(1,532)	(1,764)
Non-hedging derivatives | Commitments to Lend
Derivative [Line Items]
Unrealized gain (loss) recognized in other non-interest income	(1,299)	3,358	5,259
Realized (loss) in discontinued operations	$ 57,699	$ 33,982	$ 50,879

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- Definition

The favorable changes in credit valuation adjustments on derivative instruments that were recognized in other non-interest income during the current period.

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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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