DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Values of Derivative Instruments (Details) $ in Thousands	Sep. 30, 2024 USD ($) instrument	Dec. 31, 2023 USD ($) instrument
Designated as Hedging Instrument
Derivative [Line Items]
Notional	$ 1,500,000	$ 750,000
Derivative asset	32,323	15,578
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	7,708,070	5,997,253
Total derivatives	$ 25,090	$ 2,005
Interest rate swaps | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	18	9
Notional	$ 1,500,000	$ 750,000
Derivative asset	32,323	15,578
Interest rate swaps | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	131,543	136,924
Derivative liability	(131,543)	(136,924)
Interest rate swaps | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	2,875,981	2,428,306
Interest rate swaps | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	2,875,981	2,383,443
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	1,071	637
Derivative liability	(2)
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	67,991	34,651
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	390
Forward sale commitments | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	42	1
Derivative liability	(258)	(283)
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	14,548	1,000
Forward sale commitments | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	58,479	37,348
FX forwards | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	1,360	429
Derivative liability	(1,217)	(409)
FX forwards | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	34,636	15,812
FX forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	33,204	13,064
Risk participation agreements sold | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(112)	(3)
Risk participation agreements sold | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	102,449	103,648
Risk participation agreements purchased | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	56	78
Risk participation agreements purchased | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	89,053	116,804
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(8,173)	(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	$ 55,358	$ 113,177