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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
6 Months Ended
Jun. 30, 2023
USD ($)
instrument
Dec. 31, 2022
USD ($)
Derivative [Line Items]    
Notional amount $ 4,539,818,000 $ 4,524,514,000
Cash collateral pledged 0  
Amortized cost of securities pledged as collateral to derivative counterparties 10,100,000  
Fair value of securities as pledged collateral to derivative counterparties 9,900,000  
Commercial counterparties    
Derivative [Line Items]    
Net asset position 45,500,000 51,200,000
Non-hedging derivatives    
Derivative [Line Items]    
Notional amount 9,369,000 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 $ 3,730,449,000 3,720,400,000
Interest rate swaps    
Derivative [Line Items]    
Notional amount 6,600,000  
Cash collateral pledged 0 0
Interest rate swaps | Commercial counterparties    
Derivative [Line Items]    
Cash collateral pledged 0 0
Net asset position 2,300,000 1,000,000
Collateral already posted, aggregate fair value 93,100,000 96,100,000
Interest rate swaps | Institutional counterparties    
Derivative [Line Items]    
Cash collateral pledged 0 0
Collateral already posted, aggregate fair value $ 1,600,000 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 3,400,000,000  
Risk participation agreements with dealer banks | Economic hedging | Economic hedges    
Derivative [Line Items]    
Notional amount 348,136,000 $ 341,885,000
Forward sale commitments | Economic hedging | Economic hedges    
Derivative [Line Items]    
Notional amount $ 8,900,000  
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%