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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 308,819 | $ 112,607
Derivative liabilities | 308,888 | 112,616
Other Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Risk Derivative Liabilities, at Fair Value |  | 900
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 6,306 | 2,636
Derivative liabilities | 197,955 | 70,808
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 197,886 | 70,799
Derivative liabilities | $ 6,306 | $ 2,636

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