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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 USD ($) instrument | Dec. 31, 2023 USD ($)
Derivative [Line Items] |  |
Notional amount | $ 4,784,420,000 | $ 4,787,190,000
Cash collateral pledged | 0 |
Amortized cost of securities pledged as collateral to derivative counterparties | 9,600,000 |
Fair value of securities as pledged collateral to derivative counterparties | 9,200,000 |
Commercial counterparties |  |
Derivative [Line Items] |  |
Net asset position | 28,200,000 | 39,800,000
Non-hedging derivatives |  |
Derivative [Line Items] |  |
Notional amount | 24,185,000 | 11,104,000
Cash flow hedges |  |
Derivative [Line Items] |  |
Notional amount | 600,000,000 |
Cash flow hedges | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | 800,000,000 | 800,000,000
Economic hedging |  |
Derivative [Line Items] |  |
Credit valuation adjustments | $ 0 |
Economic hedging | Interest rate swap on tax advantaged economic development bond |  |
Derivative [Line Items] |  |
Fixed rate of interest | 5.09% |
Maturity period | 21 years |
Economic hedging | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | $ 3,960,235,000 | 3,976,086,000
Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 5,500,000 |
Cash collateral pledged | 0 | 0
Interest rate swaps | Commercial counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | 0 | 0
Net asset position | 16,900,000 | 6,000,000.0
Collateral already posted, aggregate fair value | 46,600,000 | 69,800,000
Interest rate swaps | Institutional counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | 0 | 0
Collateral already posted, aggregate fair value | $ 17,300,000 | 6,100,000
Interest rate swaps | Minimum |  |
Derivative [Line Items] |  |
Derivative, term | 6 months |
Interest rate swaps | Maximum |  |
Derivative [Line Items] |  |
Derivative, term | 2 years |
Interest rate swaps | Cash flow hedges |  |
Derivative [Line Items] |  |
Number of instruments | instrument | 8 |
Interest rate swaps | Cash flow hedges | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | $ 800,000,000 | 600,000,000
Interest rate swaps | Economic hedging | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | 3,600,000,000 | 3,600,000,000
Risk participation agreements with dealer banks | Economic hedging | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | 343,673,000 | 376,553,000
Forward sale commitments | Economic hedging | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount | $ 5,500,000 | 2,200,000
Interest rate collars | Cash flow hedges |  |
Derivative [Line Items] |  |
Number of instruments | instrument | 2 |
Interest rate collars | Cash flow hedges | Minimum |  |
Derivative [Line Items] |  |
Derivative, term | 1 year |
Interest rate collars | Cash flow hedges | Maximum |  |
Derivative [Line Items] |  |
Derivative, term | 2 years |
Interest rate collars | Cash flow hedges | Designated as hedging |  |
Derivative [Line Items] |  |
Notional amount |  | $ 200,000,000
First Interest Rate Collars | Cash flow hedges |  |
Derivative [Line Items] |  |
Notional amount | $ 100,000,000 |
Floor interest rate | 3.00% |
Cap interest rate | 5.75% |
Second Interest Rate Collars | Cash flow hedges |  |
Derivative [Line Items] |  |
Notional amount | $ 100,000,000 |
Floor interest rate | 3.25% |
Cap interest rate | 5.75% |

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