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DERIVATIVES - Disclosure by Type of Financial Instrument (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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