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DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 148,071 | $ 29,189
Derivative liabilities | 148,101 | 29,188
Other Credit Derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Credit Risk Derivative Liabilities, at Fair Value |  | 0
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 3,067 | 11,787
Derivative liabilities | 95,495 | 17,401
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 95,465 | 17,402
Derivative liabilities | $ 3,067 | $ 11,787

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