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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 18,498,760 $ 11,875,690
Derivative Asset 240,010 272,499
Derivative liabilities 240,086 272,606
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,348,651 2,300,336
Derivative Asset 108,298 184,777
Derivative liabilities 5,215 107
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 2,348,651 2,300,336
Derivative Asset 5,215 107
Derivative liabilities 108,374 184,884
Foreign Exchange | Matched interest rate swaps | Accrued interest and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 6,900,729 3,637,509
Derivative Asset 70,680 60,366
Derivative liabilities 55,817 27,249
Foreign Exchange | Matched interest rate swaps | Accrued interest and other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 6,900,729 3,637,509
Derivative Asset 55,817 27,249
Derivative liabilities $ 70,680 $ 60,366