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DERIVATIVES (Summary of the Derivatives) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Pay Fixed - Receive Floating Interest Rate Swaps | Not Designated as accounting hedges |  |
Summary of the derivative designated as a cash flow hedge |  |
Derivative, amount | $ 2,393,919 | $ 2,356,453
Asset | 22,420 | 212
Liabilities | 84,030 | 163,148
Pay Floating - Receive Fixed Interest Rate Swaps | Not Designated as accounting hedges |  |
Summary of the derivative designated as a cash flow hedge |  |
Derivative, amount | 2,393,919 | 2,356,453
Asset | 84,030 | 163,148
Liabilities | 22,420 | 212
Cash Flow Hedging |  |
Summary of the derivative designated as a cash flow hedge |  |
Derivative, amount | 200,000 |
Cash Flow Hedging | Designated as accounting hedges |  |
Summary of the derivative designated as a cash flow hedge |  |
Derivative, amount | 200,000 | 0
Asset | 0 | 0
Liabilities | 1,808 | 0
Fair Value Hedging | Designated as accounting hedges |  |
Summary of the derivative designated as a cash flow hedge |  |
Derivative, amount | 171,323 | 124,726
Asset | 2,139 |
Liabilities | $ 7,949 | $ 12,483

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