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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Cash Collateral Pledged | $ 30,450 | $ 10,700
MNA counterparty |  |
Derivative [Line Items] |  |
Cash Collateral Pledged | 30,450 | 10,700
Customer loan derivative liability |  |
Derivative [Line Items] |  |
Derivative liabilities | (28,036) | (8,046)
Customer loan derivative liability | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (16,965) | (4,669)
Customer loan derivative liability | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (11,071) | (3,377)
Customer loan derivative asset |  |
Derivative [Line Items] |  |
Derivative Assets | 28,036 | 8,046
Customer loan derivative asset | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | 16,965 | 4,669
Customer loan derivative asset | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | $ 11,071 | $ 3,377

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