DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Values of Derivative Instruments (Details) $ in Thousands	Jun. 30, 2024 USD ($) instrument	Dec. 31, 2023 USD ($) instrument
Designated as Hedging Instrument
Derivative [Line Items]
Notional	$ 1,200,000	$ 750,000
Derivative asset	13,141	15,578
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	7,045,644	5,997,253
Total derivatives	$ 5,303	$ 2,005
Interest rate swaps | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	15	9
Notional	$ 1,200,000	$ 750,000
Derivative asset	13,141	15,578
Interest rate swaps | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	159,901	136,924
Derivative liability	(159,901)	(136,924)
Interest rate swaps | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	2,710,817	2,428,306
Interest rate swaps | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	2,701,548	2,383,443
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	906	637
Derivative liability	(2)
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	55,558	34,651
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	145
Forward sale commitments | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	80	1
Derivative liability	(97)	(283)
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	23,750	1,000
Forward sale commitments | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	39,898	37,348
FX forwards | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	1,007	429
Derivative liability	(873)	(409)
FX forwards | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	30,543	15,812
FX forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	20,470	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	102,374	103,648
Risk participation agreements purchased | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	43	78
Risk participation agreements purchased | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	86,730	116,804
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(8,900)	(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	$ 73,811	$ 113,177