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v3.23.1

DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) instrument | Dec. 31, 2022 USD ($)
Derivative [Line Items] |  |
Notional amount | $ 4,537,079,000 | $ 4,524,514,000
Cash collateral pledged | 0 |
Amortized cost of securities pledged as collateral to derivative counterparties | 11,400,000 |
Fair value of securities as pledged collateral to derivative counterparties | 11,200,000 |
Commercial counterparties |  |
Derivative [Line Items] |  |
Net asset position | 37,000,000 | 51,200,000
Non-hedging derivatives |  |
Derivative [Line Items] |  |
Notional amount | 6,587,000 | 4,114,000
Cash flow hedges |  |
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 | Economic hedges |  |
Derivative [Line Items] |  |
Notional amount | $ 3,730,492,000 | 3,720,400,000
Interest rate swaps |  |
Derivative [Line Items] |  |
Notional amount | 6,900,000 |
Cash collateral pledged | 0 | 0
Interest rate swaps | Commercial counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | 0 | 0
Net asset position | 7,300,000 | 1,000,000
Collateral already posted, aggregate fair value | 71,100,000 | 96,100,000
Interest rate swaps | Institutional counterparties |  |
Derivative [Line Items] |  |
Cash collateral pledged | 0 | 0
Collateral already posted, aggregate fair value | $ 3,300,000 | 1,200,000
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 | Cash flow hedges |  |
Derivative [Line Items] |  |
Number of instruments | instrument | 8 |
Interest rate swaps | Cash flow hedges | Economic hedges |  |
Derivative [Line Items] |  |
Notional amount | $ 800,000,000 |
Interest rate swaps | Economic hedging | Economic hedges |  |
Derivative [Line Items] |  |
Notional amount | 3,300,000,000 |
Risk participation agreements with dealer banks | Economic hedging | Economic hedges |  |
Derivative [Line Items] |  |
Notional amount | 356,227,000 | $ 341,885,000
Forward sale commitments | Economic hedging | Economic hedges |  |
Derivative [Line Items] |  |
Notional amount | $ 1,500,000 |
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 | 3 years |
Interest rate collars | Cash flow hedges | Maximum |  |
Derivative [Line Items] |  |
Derivative, term | 4 years |
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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