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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) instrument | Dec. 31, 2021 USD ($)
Derivative [Line Items] |  |
Derivative, notional amount | $ 4,524,514,000 | $ 3,711,905,000
Amortized cost of securities pledged as collateral to derivative counterparties | 12,000,000 | 34,800,000
Fair value of securities as pledged collateral to derivative counterparties | 12,000,000 | 34,900,000
Cash pledged as collateral to derivative counterparties |  | 43,700,000
Interest Rate Swap |  |
Derivative [Line Items] |  |
Cash pledged as collateral to derivative counterparties | 0 | 43,694,000
Interest Rate Swap | Financial institutions counterparties |  |
Derivative [Line Items] |  |
Derivative asset, fair value, amount offset against collateral | 51,200,000 | 2,200,000
Amount of collateral posted for the net liability positions | 1,200,000 | 33,300,000
Interest Rate Swap | Commercial counterparties |  |
Derivative [Line Items] |  |
Cash pledged as collateral to derivative counterparties | 0 | 0
Derivative asset, fair value, amount offset against collateral | 1,000,000 | 76,800,000
Amount of collateral posted for the net liability positions | 96,100,000 | 2,500,000
Non-hedging derivatives: |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 4,114,000 | 8,192,000
Economic Hedging | Tax advantaged economic development bonds |  |
Derivative [Line Items] |  |
Fixed rate of interest (percent) | 5.09% |
Maturity period (in years) | 21 years |
Economic Hedging | Interest Rate Swap | Tax advantaged economic development bonds |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 7,100,000 |
Economic Hedging | Hedging derivatives |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,720,400,000 | 3,703,713,000
Economic Hedging | Hedging derivatives | Interest Rate Swap |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,400,000,000 |
Economic Hedging | Hedging derivatives | Interest Rate Swap | Tax advantaged economic development bonds |  |
Derivative [Line Items] |  |
Derivative, notional amount | 7,062,000 | 7,879,000
Economic Hedging | Hedging derivatives | Risk Participation Agreements |  |
Derivative [Line Items] |  |
Derivative, notional amount | 341,885,000 | 320,981,000
Economic Hedging | Hedging derivatives | Forward Commitments |  |
Derivative [Line Items] |  |
Derivative, notional amount | 927,000 | $ 6,377,000
Cash Flow Hedging |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 800,000,000 |
Cash Flow Hedging | Interest Rate Swap |  |
Derivative [Line Items] |  |
Number of interest rate swap contracts (contract) | instrument | 6 |
Cash Flow Hedging | Interest Rate Swap | Minimum |  |
Derivative [Line Items] |  |
Durations of derivative instruments | 2 years |
Cash Flow Hedging | Interest Rate Swap | Maximum |  |
Derivative [Line Items] |  |
Durations of derivative instruments | 4 years |
Cash Flow Hedging | Interest Rate Swap | Commercial Loan |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 400,000,000 |
Cash Flow Hedging | Interest Rate Collars |  |
Derivative [Line Items] |  |
Number of interest rate swap contracts (contract) | instrument | 2 |
Cash Flow Hedging | Interest Rate Collars | Minimum |  |
Derivative [Line Items] |  |
Durations of derivative instruments | 3 years |
Cash Flow Hedging | Interest Rate Collars | Maximum |  |
Derivative [Line Items] |  |
Durations of derivative instruments | 4 years |
Cash Flow Hedging | Interest Rate Collars | Commercial Loan |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 200,000,000 |
Cash Flow Hedging | First Interest Rate Collars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 100,000,000 |
Derivative, floor interest rate | 3.00% |
Derivative, cap interest rate | 5.75% |
Cash Flow Hedging | Second Interest Rate Collars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 100,000,000 |
Derivative, floor interest rate | 3.25% |
Derivative, cap interest rate | 5.75% |
Cash Flow Hedging | Forward Starting Interest Rate Swaps |  |
Derivative [Line Items] |  |
Number of interest rate swap contracts (contract) | instrument | 2 |
Cash Flow Hedging | Forward Starting Interest Rate Swaps | Commercial Loan |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 200,000,000 |
Cash Flow Hedging | Interest Rate Swap And Forward Starting INterest Rate Swap |  |
Derivative [Line Items] |  |
Derivative, notional amount | 600,000,000 |
Cash Flow Hedging | Hedging derivatives | Interest Rate Swap |  |
Derivative [Line Items] |  |
Derivative, notional amount | 600,000,000 |
Cash Flow Hedging | Hedging derivatives | Interest Rate Collars |  |
Derivative [Line Items] |  |
Derivative, notional amount | $ 200,000,000 |

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