DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Fair Values of Derivative Instruments (Details) $ in Thousands	Mar. 31, 2025 USD ($) instrument	Dec. 31, 2024 USD ($) instrument
Derivatives in Cash Flow Hedging Relationships
Derivative [Line Items]
Notional	$ 1,500,000	$ 1,500,000
Derivative asset	16,326	14,265
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	7,868,974	7,802,391
Total derivatives	$ 12,659	$ 9,977
Interest rate options | Derivatives in Cash Flow Hedging Relationships
Derivative [Line Items]
Count | instrument	18	18
Notional	$ 1,500,000	$ 1,500,000
Derivative asset	16,326	14,265
Interest rate options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	131,678	153,980
Derivative liability	(131,680)	(153,980)
Interest rate options | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	2,955,827	2,942,675
Interest rate options | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	2,955,827	2,942,675
Interest rate lock commitments with clients | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	1,067	612
Derivative liability	(4)	(18)
Interest rate lock commitments with clients | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	70,720	41,238
Interest rate lock commitments with clients | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	1,669	3,658
Forward sale commitments | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	15	200
Derivative liability	(261)	(39)
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	5,141	28,927
Forward sale commitments | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	67,817	27,071
FX forwards | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	662	1,407
Derivative liability	(564)	(1,205)
FX forwards | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	28,922	26,716
FX forwards | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	18,811	25,924
Risk participation agreements sold | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(104)	(90)
Risk participation agreements sold | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	110,493	110,948
Risk participation agreements purchased | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative asset	33	25
Risk participation agreements purchased | Derivatives not designated as hedging instruments | Other assets
Derivative [Line Items]
Notional	99,941	97,201
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative liability	(4,509)	(5,180)
Financial derivatives related to sales of certain Visa Class B shares | Derivatives not designated as hedging instruments | Other liabilities
Derivative [Line Items]
Notional	$ 53,806	$ 55,358