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DERIVATIVE FINANCIAL INSTRUMENTS - Qualified Hedging Instruments (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Derivative [Line Items] |  |
Derivative, notional amount | $ 268,844 | $ 273,219
Changes in fair value on the interest rate swaps | $ 100 |

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