DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 17,341,448	$ 17,683,691
Derivative Asset	472,684	212,970
Derivative liabilities	472,684	212,977
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,259,389	2,430,587
Derivative Asset	1,404	84,694
Derivative liabilities	162,069	7,508
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,259,389	2,430,587
Derivative Asset	162,069	7,508
Derivative liabilities	1,404	84,701
Foreign Exchange | Matched interest rate swaps | Accrued interest and other assets
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,424,594	6,423,085
Derivative Asset	171,167	67,988
Derivative liabilities	138,044	52,780
Foreign Exchange | Matched interest rate swaps | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	6,398,076	6,399,432
Derivative Asset	138,044	52,780
Derivative liabilities	$ 171,167	$ 67,988