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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Amounts Included in the Consolidated Statements of Income Related to Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Hedging derivatives | Economic Hedging | Interest Rate Swap | Industrial Revenue Bond
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	$ 941	$ 619	$ (289)
Hedging derivatives | Economic Hedging | Interest Rate Swap | Commercial loan
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(171,272)	(86,099)	85,206
Hedging derivatives | Economic Hedging | Reverse Interest Rate Swaps | Commercial loan
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	171,272	86,099	(85,206)
Favorable/(unfavorable) change in credit valuation adjustment recognized in other non-interest income	1,809	1,431	(1,516)
Hedging derivatives | Economic Hedging | Risk Participation Agreements
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(521)	(233)	345
Hedging derivatives | Economic Hedging | Forward Commitments
Derivative [Line Items]
Realized gain (loss) in discontinued operations	0	0	(8,205)
Hedging derivatives | Economic Hedging | Forward Commitments | Noninterest Income
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(126)	(186)	0
Hedging derivatives | Economic Hedging | Forward Commitments | Discontinued operations
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	0	0	547
Non-hedging derivatives: | Commitments to Lend
Derivative [Line Items]
Realized gain in other non-interest income	462	2,854	0
Realized gain (loss) in discontinued operations	0	0	15,672
Non-hedging derivatives: | Commitments to Lend | Noninterest Income
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(107)	(611)	0
Non-hedging derivatives: | Commitments to Lend | Discontinued operations
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	$ 0	$ 0	$ (1,893)

X

- Definition

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

+ References

No definition available.

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228

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-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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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.

+ References

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-SubTopic 10
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