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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jul. 01, 2023
Derivative [Line Items]        
Notional amount of derivatives $ 7,691,719 $ 7,936,239    
Fair value liability 1,300 1,900    
Credit risk-related contingent features, net liability position 65,600 8,700    
Credit risk-related contingent features, posted collateral 66,000 8,500    
Derivatives Designated as Hedging Instruments [Member]        
Derivative [Line Items]        
Notional amount of derivatives 2,027,500 2,816,000    
Interest Rate Swaps [Member] | Libor Transition [Member]        
Derivative [Line Items]        
Notional amount of derivatives       $ 3,500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member]        
Derivative [Line Items]        
Amortization of accumulated other comprehensive loss on terminated cash flow hedges 2,900   $ 23,700  
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2025 [Member]        
Derivative [Line Items]        
Notional amount of derivatives $ 50,000      
Derivative maturity expiration year 2025      
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Agreement Four [Member]        
Derivative [Line Items]        
Notional amount of derivatives $ 475,000      
Derivative maturity expiration year 2026      
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 5, Expires 2027 [Member]        
Derivative [Line Items]        
Notional amount of derivatives $ 925,000      
Derivative maturity expiration year 2027      
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 6, Expires Thereafter [Member]        
Derivative [Line Items]        
Notional amount of derivatives $ 100,000      
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]        
Derivative [Line Items]        
Amortization of accumulated other comprehensive loss on terminated cash flow hedges 19,300 90,600    
Risk Participation Agreements [Member] | Libor Transition [Member]        
Derivative [Line Items]        
Notional amount of derivatives       $ 163,500
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]        
Derivative [Line Items]        
Notional amount of derivatives 477,500 $ 716,000    
Derivative hedged item 454,600      
Basis adjustment associated with hedged items loss 22,900      
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member]        
Derivative [Line Items]        
Amortized cost basis of closed portfolio of pre-payable securities $ 514,400