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Derivative Instruments (Gains (Losses) Related to Derivatives and Hedged Items) (Details) - Interest rate swaps - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Designated as Hedging Instrument | Fair Value Hedging        
Derivative [Line Items]        
Derivative, change in unrealized gain (loss) on fair value hedging instruments $ 0 $ 188,667 $ 5,856 $ 215,438
Change in unrealized gain (loss) on hedged item in fair value hedge 0 (214,414) 3,240 (247,507)
Net, derivative, fair value hedge, included in effectiveness, gain (loss) 0 (25,747) 9,096 (32,069)
Not Designated as Hedging Instrument        
Derivative [Line Items]        
Amount excluded: recognized in income immediately $ 0 $ 11,301 $ 0 $ 13,957