DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 19,470,720	$ 19,339,867
Derivative Asset	362,200	269,776
Derivative liabilities	(361,745)	(263,131)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	18,470,720	18,339,867
Derivative Asset	361,227	262,880
Derivative liabilities	(361,393)	(263,131)
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,000,000	1,000,000
Derivative Asset	973	6,896
Derivative liabilities	(352)	0
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,220,151	2,172,714
Derivative Asset	7,683	13,232
Derivative liabilities	(120,986)	(104,343)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,220,151	2,172,714
Derivative Asset	120,820	104,092
Derivative liabilities	(7,683)	(13,232)
Foreign Exchange | Matched interest rate swaps | Accrued interest and other assets | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	7,042,511	7,021,569
Derivative Asset	123,975	84,731
Derivative liabilities	(108,749)	(60,825)
Foreign Exchange | Matched interest rate swaps | Accrued interest and other liabilities | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,987,907	6,972,870
Derivative Asset	108,749	60,825
Derivative liabilities	$ (123,975)	$ (84,731)
Cash Flow Hedging | Interest Rate Floor | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Cash Flow Hedging | Interest Rate Floor | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,000,000	$ 1,000,000
Cash Flow Hedging | Interest Rate Floor | Accrued interest and other liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 1,000,000	$ 1,000,000