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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Jul. 01, 2023
Dec. 31, 2022
Derivative [Line Items]      
Notional amount of derivatives $ 7,690,027   $ 7,936,239
Fair value liability 1,400   1,900
Credit risk-related contingent features, net liability position 96,500   8,700
Credit risk-related contingent features, posted collateral 97,500   8,500
Derivatives Designated as Hedging Instruments [Member]      
Derivative [Line Items]      
Notional amount of derivatives 2,063,500   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    
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] | Swap Agreement 4, Expires 2026 [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 2028 [Member]      
Derivative [Line Items]      
Notional amount of derivatives $ 100,000    
Derivative maturity expiration year 2028    
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 $ 16,600    
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 513,500   $ 716,000
Derivative hedged item 473,400    
Basis adjustment associated with hedged items (40,100)    
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 $ 558,600