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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) institution instrument | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) institution instrument | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) instrument
Derivative [Line Items] |  |  |  |  |
Interest rate cash flow hedge expense reclassified to interest income (prior year less than) | $ 1,300 | $ 400 | $ 3,100 | $ 600 |
Number of variable-rate to fixed-rate swap transactions | instrument | 161 |  | 161 |  | 188
Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Remaining maturity period | 1 year |  | 1 year |  |
Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Remaining maturity period | 11 years |  | 11 years |  |
Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | $ 1,500,000 |  | $ 1,500,000 |  | $ 750,000
Interest rate swaps and options | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Count | instrument | 18 |  | 18 |  | 9
Purchase of derivatives |  |  | $ 29,700 |  |
Notional | $ 1,500,000 |  | 1,500,000 |  | $ 750,000
Swap Guarantee |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | $ 100 |  | $ 100 |  |
Number of financial institutions | institution | 1 |  | 1 |  |
Aggregate fair value of swaps to customers | $ 6,000 |  | $ 6,000 |  | 7,300
Interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional | $ 700,000 |  | $ 700,000 |  | $ 700,000
Number of variable-rate to fixed-rate swap transactions | instrument | 1 |  | 1 |  | 0
Cash |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Collateral value against obligations | $ 3,700 |  | $ 3,700 |  |

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