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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Cash Collateral Pledged | $ 26,200 | $ 10,700
MNA counterparty |  |
Derivative [Line Items] |  |
Cash Collateral Pledged | 26,200 | 10,700
Customer loan derivative liability |  |
Derivative [Line Items] |  |
Derivative liabilities | (24,933) | (8,046)
Customer loan derivative liability | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (15,463) | (4,669)
Customer loan derivative liability | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (9,470) | (3,377)
Customer loan derivative asset |  |
Derivative [Line Items] |  |
Derivative Assets | 24,933 | 8,046
Customer loan derivative asset | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | 15,463 | 4,669
Customer loan derivative asset | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | $ 9,470 | $ 3,377

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