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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |
Interest expense | $ 2,677,000 | $ 5,770,000 | $ 10,759,000 | $ 18,337,000 |
Unrealized loss to be reclassified as a reduction of interest expense |  |  | 0 |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 5,000,000 |  | 5,000,000 |  | $ 5,000,000
Interest expense |  |  | 509,000 | $ 495,000 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | FHLB Advances |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 40,000,000 |  | $ 40,000,000 |  |

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