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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) instrument | Dec. 31, 2021 USD ($)
Derivative [Line Items] |  |
Notional amount | $ 4,043,682,000 | $ 3,711,905,000
Cash collateral pledged | 14,900,000 |
Amortized cost of securities pledged as collateral to derivative counterparties | 22,500,000 |
Fair value of securities as pledged collateral to derivative counterparties | 22,300,000 |
Commercial counterparties |  |
Derivative [Line Items] |  |
Net asset position | 52,800,000 | 2,200,000
Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 7,300,000 |
Cash collateral pledged | $ 14,863,000 | 43,694,000
Interest rate swaps | Minimum |  |
Derivative [Line Items] |  |
Derivative, term | 2 years |
Interest rate swaps | Maximum |  |
Derivative [Line Items] |  |
Derivative, term | 3 years |
Interest rate swaps | Commercial counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | $ 0 | 0
Net asset position | 98,000 | 76,800,000
Collateral already posted, aggregate fair value | 95,900,000 | 2,500,000
Interest rate swaps | Institutional counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | 14,863,000 | 43,694,000
Collateral already posted, aggregate fair value | 190,000 | 33,300,000
Non-hedging derivatives: |  |
Derivative [Line Items] |  |
Notional amount | 3,132,000 | 8,192,000
Economic hedges |  |
Derivative [Line Items] |  |
Credit valuation adjustments | $ 0 |
Economic hedges | Interest rate swap on tax advantaged economic development bond |  |
Derivative [Line Items] |  |
Fixed rate of interest | 5.09% |
Maturity period | 21 years |
Economic hedges | Economic hedges: |  |
Derivative [Line Items] |  |
Notional amount | $ 3,640,550,000 | 3,703,713,000
Economic hedges | Economic hedges: | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 3,300,000,000 |
Economic hedges | Economic hedges: | Interest rate swaps | Commercial loan |  |
Derivative [Line Items] |  |
Notional amount | 1,653,839,000 | 1,684,238,000
Economic hedges | Economic hedges: | Risk participation agreements with dealer banks |  |
Derivative [Line Items] |  |
Notional amount | 325,063,000 | $ 320,981,000
Economic hedges | Economic hedges: | Forward sale commitments |  |
Derivative [Line Items] |  |
Notional amount | 1,000,000 |
Cash flow hedges: |  |
Derivative [Line Items] |  |
Notional amount | $ 400,000,000 |
Cash flow hedges: | Interest rate swaps |  |
Derivative [Line Items] |  |
Number of instruments | instrument | 3 |
Cash flow hedges: | Interest rate swaps | Commercial loan |  |
Derivative [Line Items] |  |
Notional amount | $ 225,000,000 |
Cash flow hedges: | Forward Starting Interest Rate Swaps |  |
Derivative [Line Items] |  |
Number of instruments | instrument | 3 |
Cash flow hedges: | Forward Starting Interest Rate Swaps | Commercial loan |  |
Derivative [Line Items] |  |
Notional amount | $ 175,000,000 |
Cash flow hedges: | Economic hedges: | Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | $ 400,000,000 |

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