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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | $ 17,479,999 | $ 17,683,691
Derivative Asset | 219,745 | 212,970
Derivative liabilities | 219,745 | 212,977
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,348,703 | 2,430,587
Derivative Asset | 18,399 | 84,694
Derivative liabilities | 55,970 | 7,508
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 2,348,703 | 2,430,587
Derivative Asset | 55,970 | 7,508
Derivative liabilities | 18,399 | 84,701
Foreign Exchange | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6,406,294 | 6,423,085
Derivative Asset | 85,265 | 67,988
Derivative liabilities | 60,111 | 52,780
Foreign Exchange | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Notional Amount | 6,376,299 | 6,399,432
Derivative Asset | 60,111 | 52,780
Derivative liabilities | $ 85,265 | $ 67,988

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