DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Values of Derivative Instruments (Details) $ in Thousands	Mar. 31, 2024 USD ($) instrument	Dec. 31, 2023 USD ($) instrument
Designated as Hedging Instrument
Derivative [Line Items]
Notional	$ 1,000,000	$ 750,000
Derivative asset	11,312	15,578
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	6,582,948	5,997,253
Total derivatives	$ (1,115)	$ 2,005
Interest rate products | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	13	9
Notional	$ 1,000,000	$ 750,000
Derivative asset	11,312	15,578
Interest rate products | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	155,994	136,924
Derivative liability	(155,994)	(136,924)
Interest rate products | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	2,547,154	2,428,306
Interest rate products | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	2,547,154	2,383,443
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	947	637
Derivative liability	0
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	54,818	34,651
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	150
Forward sale commitments | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	23	1
Derivative liability	(166)	(283)
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	7,442	1,000
Forward sale commitments | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	43,880	37,348
FX forwards | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	234	429
Derivative liability	(83)	(409)
FX forwards | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	34,021	15,812
FX forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	17,033	13,064
Risk participation agreements sold | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(2)	(3)
Risk participation agreements sold | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	103,028	103,648
Risk participation agreements purchased | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	44	78
Risk participation agreements purchased | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	115,091	116,804
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(13,424)	(14,023)
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	$ 113,177	$ 113,177