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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
12 Months Ended
Dec. 31, 2023
USD ($)
instrument
Dec. 31, 2022
USD ($)
Derivative [Line Items]    
Derivative, notional amount $ 4,787,190,000 $ 4,524,514,000
Amortized cost of securities pledged as collateral to derivative counterparties 9,800,000 12,000,000
Fair value of securities as pledged collateral to derivative counterparties 9,600,000 12,000,000
Cash pledged as collateral to derivative counterparties 0 0
Non-hedging derivatives:    
Derivative [Line Items]    
Derivative, notional amount 11,104,000 4,114,000
Cash Flow Hedging    
Derivative [Line Items]    
Derivative, notional amount $ 800,000,000 800,000,000
Economic Hedging | Tax advantaged economic development bonds    
Derivative [Line Items]    
Fixed rate of interest (percent) 5.09%  
Maturity period 21 years  
Economic Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount $ 3,976,086,000 3,720,400,000
Interest Rate Swap    
Derivative [Line Items]    
Cash pledged as collateral to derivative counterparties 0 0
Interest Rate Swap | Financial institutions counterparties    
Derivative [Line Items]    
Derivative asset, fair value, amount offset against collateral 39,800,000 51,200,000
Amount of collateral posted for the net liability positions 6,100,000 1,200,000
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 6,000,000 1,000,000
Amount of collateral posted for the net liability positions $ 69,800,000 96,100,000
Interest Rate Swap | Cash Flow Hedging    
Derivative [Line Items]    
Number of interest rate swap contracts (contract) | instrument 8  
Interest Rate Swap | Cash Flow Hedging | Minimum    
Derivative [Line Items]    
Durations of derivative instruments 2 years  
Interest Rate Swap | Cash Flow Hedging | Maximum    
Derivative [Line Items]    
Durations of derivative instruments 3 years  
Interest Rate Swap | Cash Flow Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount $ 600,000,000  
Interest Rate Swap | Economic Hedging | Tax advantaged economic development bonds    
Derivative [Line Items]    
Derivative, notional amount 6,200,000  
Interest Rate Swap | Economic Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount 3,600,000,000  
Interest Rate Swap | Economic Hedging | Hedging derivatives | Tax advantaged economic development bonds    
Derivative [Line Items]    
Derivative, notional amount $ 6,202,000 7,062,000
Interest rate collars | Cash Flow Hedging    
Derivative [Line Items]    
Number of interest rate swap contracts (contract) | instrument 2  
Interest rate collars | Cash Flow Hedging | Minimum    
Derivative [Line Items]    
Durations of derivative instruments 3 years  
Interest rate collars | Cash Flow Hedging | Maximum    
Derivative [Line Items]    
Durations of derivative instruments 4 years  
Interest rate collars | Cash Flow Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount $ 200,000,000  
Risk Participation Agreements | Economic Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount 376,553,000 341,885,000
Forward Commitments | Economic Hedging | Hedging derivatives    
Derivative [Line Items]    
Derivative, notional amount 2,207,000 $ 927,000
Interest Rate Swap And Forward Starting INterest Rate Swap | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, notional amount 600,000,000  
First Interest Rate Collars | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, notional amount $ 100,000,000  
Derivative, cap interest rate 5.75%  
Derivative, floor interest rate 3.00%  
Second Interest Rate Collars | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, notional amount $ 100,000,000  
Derivative, cap interest rate 5.75%  
Derivative, floor interest rate 3.25%