DERIVATIVES - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) entity	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) entity	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Derivative, Notional Amount	$ 18,504,223		$ 19,339,867
Number of counterparties | entity	6		6
Derivative liabilities	$ 293,926		$ 263,131
Derivative Liability, Fair Value of Collateral, net of restricted cash	142,100		116,200
Derivative Liability, Fair Value of Collateral	162,100		137,800
Restricted Cash	20,000		21,600
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(336)	$ 0	$ 3,755	$ 0
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	700
Client derivative fees	$ 1,250	$ 1,005
Foreign Exchange
Derivative [Line Items]
Number of counterparties | entity	5		5
Credit Risk Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 217,600		$ 232,500
Credit Risk Derivative Liabilities, at Fair Value	100		100
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	43,600		25,200
Other Credit Derivatives [Member]
Derivative [Line Items]
Derivative, Notional Amount	38,300		25,500
Credit Risk Derivative Liabilities, at Fair Value	500
Credit Risk Derivative Assets, at Fair Value			(300)
Other Contract-Mortgage
Derivative [Line Items]
Derivative, Notional Amount	108,600		109,200
Derivative
Derivative [Line Items]
Derivative liabilities	120,000		95,700
Derivative | Foreign Exchange
Derivative [Line Items]
Derivative, Notional Amount			7,000,000
Derivative liabilities	36,300		23,900
Accrued interest and other liabilities | Derivative
Derivative [Line Items]
Derivative, Notional Amount	2,200,000		$ 2,200,000
Accrued interest and other liabilities | Derivative | Foreign Exchange
Derivative [Line Items]
Derivative, Notional Amount	$ 6,600,000