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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Dec. 31, 2021
Derivative [Line Items]      
Notional amount of derivatives $ 8,684,485   $ 8,649,657
Fair value liability 3,500   4,100
Credit risk-related contingent features, net liability position 600   49,400
Credit risk-related contingent features, posted collateral 700   15,000
Derivatives Designated as Hedging Instruments [Member]      
Derivative [Line Items]      
Notional amount of derivatives 3,019,650   2,962,650
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 23,700    
Notional amount of derivatives 100,000    
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member]      
Derivative [Line Items]      
Notional amount of derivatives 425,000    
Derivative maturity expiration year   2022  
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member]      
Derivative [Line Items]      
Notional amount of derivatives 150,000    
Derivative maturity expiration year   2023  
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2026 [Member]      
Derivative [Line Items]      
Notional amount of derivatives 250,000    
Derivative maturity expiration year   2026  
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2027 [Member]      
Derivative [Line Items]      
Notional amount of derivatives 400,000    
Derivative maturity expiration year   2027  
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 6,500    
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]      
Derivative [Line Items]      
Notional amount of derivatives 1,694,650   $ 1,837,650
Derivative hedged item   $ 1,600,000  
Basis adjustment associated with hedged items 60,200    
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 $ 1,900,000