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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest rate swaps | Economic hedges | Industrial revenue bond
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	$ (68)	$ 432
Interest rate swaps | Economic hedges | Loans with commercial loan customers
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	27,024	(78,698)
Favorable change in credit valuation adjustment recognized in other non-interest income	0	867
Reverse interest rate swaps | Economic hedges | Loans with commercial loan customers
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(27,024)	78,698
Risk participation agreements | Economic hedges
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(16)	(108)
Forward commitments | Economic hedges
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	7	(127)
Commitments to lend | Non-hedging derivatives
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	9	(106)
Realized gain in other non-interest income	$ 39	$ 252

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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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- Definition

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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- Definition

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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