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DERIVATIVES AND HEDGING ACTIVITIES - Fair Value Hedges Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |
Interest income from swap transaction |  |  | $ 0 |
Fair value hedges | Designated as Hedging Instrument |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |
Clearing house related to the fair value derivatives | $ 5,600,000 | $ 5,600,000 |  | $ 6,500,000
Fair value hedges | Interest Rate Swaps | Designated as Hedging Instrument |  |  |  |
DERIVATIVES AND HEDGING ACTIVITIES |  |  |  |
Average fixed interest rate | 4.82% | 4.82% |  |
Mortgage loans - Amortized Cost | $ 700,500,000 | $ 700,500,000 |  | 729,500,000
Last-of-layer in the open hedge relationship | 500,000,000.0 | 500,000,000.0 |  | 500,000,000.0
Basis adjustment associated with the hedge | 5,700,000 | 5,700,000 |  | $ 6,600,000
Interest income from swap transaction | $ 600,000 | $ 1,900,000 |  |

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