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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Cash Collateral Pledged | $ 12,700 | $ 23,450
Net Amount | 12,700 | 23,450
MNA counterparty |  |
Derivative [Line Items] |  |
Cash Collateral Pledged | 12,700 | 23,450
Net Amount | 12,700 | 23,450
Customer loan derivative liability |  |
Derivative [Line Items] |  |
Derivative liabilities | (15,426) | (25,895)
Customer loan derivative liability | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (9,944) | (15,938)
Customer loan derivative liability | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative liabilities | (5,482) | (9,957)
Customer loan derivative asset |  |
Derivative [Line Items] |  |
Derivative Assets | 15,426 | 25,895
Customer loan derivative asset | MNA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | 9,944 | 15,938
Customer loan derivative asset | RPA counterparty |  |
Derivative [Line Items] |  |
Derivative Assets | $ 5,482 | $ 9,957

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