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DERIVATIVES - Disclosure by Type of Financial Instrument (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Gross amounts of recognized liabilities $ 240,086 $ 272,606
Derivative Liability, Fair Value, Gross Asset (269,218) (402,480)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (29,132) (129,874)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities    
Derivatives, Fair Value [Line Items]    
Gross amounts of recognized liabilities 113,589 184,991
Derivative Liability, Fair Value, Gross Asset (207,890) (385,088)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (94,301) (200,097)
Fair Value Hedges | Foreign Exchange | Accrued interest and other liabilities    
Derivatives, Fair Value [Line Items]    
Gross amounts of recognized liabilities 126,497 87,615
Derivative Liability, Fair Value, Gross Asset (61,328) (17,392)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ 65,169 $ 70,223