DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Values of Derivative Instruments (Details) $ in Thousands	Sep. 30, 2023 USD ($) instrument	Dec. 31, 2022 USD ($)
Designated as Hedging Instrument
Derivative [Line Items]
Notional	$ 500,000
Derivative asset	5,508
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	5,381,768	$ 3,921,032
Total derivatives	$ (8,197)	(16,629)
Interest rate products | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	6
Notional	$ 500,000
Derivative asset	5,508
Interest rate products | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	196,508	156,414
Derivative liability	(196,508)	(156,414)
Interest rate products | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	2,226,251	1,794,678
Interest rate products | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	2,226,251	1,794,678
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	498	385
Derivative liability	(20)	(7)
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	32,747	24,673
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	3,886	1,179
Forward sale commitments | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	203	75
Derivative liability	(32)	(54)
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	21,500	9,072
Forward sale commitments | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	13,907	20,719
FX forwards | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	366	38
Derivative liability	(261)	(45)
FX forwards | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	16,687	4,177
FX forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	14,793	3,052
Risk participation agreements sold | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(1)	(2)
Risk participation agreements sold | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	97,049	68,459
Risk participation agreements purchased | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	23	81
Risk participation agreements purchased | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	115,520	87,168
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(14,481)	(17,100)
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