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, 2023	Dec. 31, 2022	Dec. 31, 2021
Hedging derivatives | Economic Hedging | Interest Rate Swap | Industrial Revenue Bond
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	$ 21	$ 941	$ 619
Hedging derivatives | Economic Hedging | Interest Rate Swap | Commercial loan
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	31,310	(171,272)	(86,099)
Hedging derivatives | Economic Hedging | Reverse Interest Rate Swaps | Commercial loan
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(31,310)	171,272	86,099
Favorable/(unfavorable) change in credit valuation adjustment recognized in other non-interest income	0	1,809	1,431
Hedging derivatives | Economic Hedging | Risk Participation Agreements
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	(74)	(521)	(233)
Hedging derivatives | Economic Hedging | Forward Commitments | Noninterest Income
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	13	(126)	(186)
Non-hedging derivatives | Commitments to lend
Derivative [Line Items]
Realized gain in other non-interest income	536	462	2,854
Non-hedging derivatives | Commitments to lend | Noninterest Income
Derivative [Line Items]
Unrealized gain/(loss) recognized in other non-interest income	$ 17	$ (107)	$ (611)