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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Swaps cancellation expenses | $ 19,287,000 | $ 16,758,000 | $ 54,302,000 | $ 48,349,000 |
Interest expense | 1,665,000 | $ 2,677,000 | 5,494,000 | 10,759,000 |
Unrealized loss to be reclassified as a reduction of interest expense |  |  | 0 |  |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | 5,000,000 |  | 5,000,000 |  |
Swaps cancellation expenses |  |  | 466,000 |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest expense |  |  | 483,000 | $ 509,000 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | FHLB Advances |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 40,000,000 |  | $ 40,000,000 |  | $ 40,000,000

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