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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Derivative [Line Items]          
Net unrealized gains (losses) arising during the period $ (73,123,000) $ (48,332,000) $ (63,123,000) $ (184,310,000)  
Income (loss) recognized (6,100,000) 1,000,000 (11,500,000) 3,200,000  
Cash flow hedge gain (loss) to be reclassified     (161,000,000)    
Cash flow hedge termination gain     23,000,000    
Right to reclaim cash collateral 87,500,000   87,500,000   $ 66,800,000
Obligation to return cash collateral 5,700,000   5,700,000   $ 7,700,000
Cash Flow Hedges          
Derivative [Line Items]          
Net unrealized gains (losses) arising during the period $ 0 $ 0 $ 0 $ 0