DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 26,054,666	$ 22,586,161
Derivative Asset	463,853	393,867
Derivative liabilities	(462,845)	(393,652)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	25,054,666	21,586,161
Derivative Asset	463,388	393,159
Derivative liabilities	(462,845)	(393,652)
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,000,000	1,000,000
Derivative Asset	465	708
Derivative liabilities	0	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	2,829,821	2,425,106
Derivative Asset	18,118	23,271
Derivative liabilities	(47,681)	(46,159)
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	2,829,821	2,425,106
Derivative Asset	47,670	46,138
Derivative liabilities	(18,081)	(23,243)
Foreign Exchange \| Matched interest rate swaps \| Accrued interest and other assets \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,674,140	8,368,518
Derivative Asset	209,227	161,649
Derivative liabilities	(182,647)	(160,523)
Foreign Exchange \| Matched interest rate swaps \| Accrued interest and other liabilities \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	9,616,763	8,318,982
Derivative Asset	182,647	160,523
Derivative liabilities	(209,227)	(161,649)
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
Commodity \| Matched interest rate swaps \| Accrued interest and other assets \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	52,354	24,180
Derivative Asset	1,206	909
Derivative liabilities	(4,228)	(994)
Commodity \| Matched interest rate swaps \| Accrued interest and other liabilities \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	51,767	24,269
Derivative Asset	4,520	669
Derivative liabilities	$ (981)	$ (1,084)

Not Designated as Hedging Instrument

Designated as Hedging Instrument

Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets | Not Designated as Hedging Instrument

Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities | Not Designated as Hedging Instrument

Foreign Exchange | Matched interest rate swaps | Accrued interest and other assets | Not Designated as Hedging Instrument

Foreign Exchange | Matched interest rate swaps | Accrued interest and other liabilities | Not Designated as Hedging Instrument

Cash Flow Hedging | Interest Rate Floor | Accrued interest and other liabilities

Cash Flow Hedging | Interest Rate Floor | Accrued interest and other liabilities | Designated as Hedging Instrument

Commodity | Matched interest rate swaps | Accrued interest and other assets | Not Designated as Hedging Instrument

Commodity | Matched interest rate swaps | Accrued interest and other liabilities | Not Designated as Hedging Instrument