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Derivative Instruments (Gains (Losses) Related to Derivatives and Hedged Items) (Details) - Interest rate swaps - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Designated as Hedging Instrument | Fair Value Hedging        
Derivative [Line Items]        
Derivative, change in unrealized gain (loss) on fair value hedging instruments $ 18,847 $ 26,771 $ 5,856 $ 26,771
Change in unrealized gain (loss) on hedged item in fair value hedge (10,876) (33,093) 3,240 (33,093)
Net, derivative, fair value hedge, included in effectiveness, gain (loss) 7,971 (6,322) 9,096 (6,322)
Not Designated as Hedging Instrument        
Derivative [Line Items]        
Amount excluded: recognized in income immediately $ 0 $ 2,656 $ 0 $ 2,656