XML 74 R62.htm IDEA: XBRL DOCUMENT v3.24.3
DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
9 Months Ended
Sep. 30, 2024
USD ($)
instrument
Dec. 31, 2023
USD ($)
Derivative [Line Items]    
Notional amount $ 4,784,420,000 $ 4,787,190,000
Cash collateral pledged 0  
Amortized cost of securities pledged as collateral to derivative counterparties 9,600,000  
Fair value of securities as pledged collateral to derivative counterparties 9,200,000  
Commercial counterparties    
Derivative [Line Items]    
Net asset position 28,200,000 39,800,000
Non-hedging derivatives    
Derivative [Line Items]    
Notional amount 24,185,000 11,104,000
Cash flow hedges    
Derivative [Line Items]    
Notional amount 600,000,000  
Cash flow hedges | Designated as hedging    
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 | Designated as hedging    
Derivative [Line Items]    
Notional amount $ 3,960,235,000 3,976,086,000
Interest rate swaps    
Derivative [Line Items]    
Notional amount 5,500,000  
Cash collateral pledged 0 0
Interest rate swaps | Commercial counterparties    
Derivative [Line Items]    
Cash collateral pledged 0 0
Net asset position 16,900,000 6,000,000.0
Collateral already posted, aggregate fair value 46,600,000 69,800,000
Interest rate swaps | Institutional counterparties    
Derivative [Line Items]    
Cash collateral pledged 0 0
Collateral already posted, aggregate fair value $ 17,300,000 6,100,000
Interest rate swaps | Minimum    
Derivative [Line Items]    
Derivative, term 6 months  
Interest rate swaps | Maximum    
Derivative [Line Items]    
Derivative, term 2 years  
Interest rate swaps | Cash flow hedges    
Derivative [Line Items]    
Number of instruments | instrument 8  
Interest rate swaps | Cash flow hedges | Designated as hedging    
Derivative [Line Items]    
Notional amount $ 800,000,000 600,000,000
Interest rate swaps | Economic hedging | Designated as hedging    
Derivative [Line Items]    
Notional amount 3,600,000,000 3,600,000,000
Risk participation agreements with dealer banks | Economic hedging | Designated as hedging    
Derivative [Line Items]    
Notional amount 343,673,000 376,553,000
Forward sale commitments | Economic hedging | Designated as hedging    
Derivative [Line Items]    
Notional amount $ 5,500,000 2,200,000
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 1 year  
Interest rate collars | Cash flow hedges | Maximum    
Derivative [Line Items]    
Derivative, term 2 years  
Interest rate collars | Cash flow hedges | Designated as hedging    
Derivative [Line Items]    
Notional amount   $ 200,000,000
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%