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Investment Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Apr. 01, 2024
USD ($)
Sep. 30, 2024
USD ($)
security
Jun. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Financing Receivable, Impaired [Line Items]              
Debt securities, available-for-sale transferred to held-to-maturity $ 2,720,000,000            
Net unamortized unrealized holding (losses) gains on available for sale investment securities transferred to held to maturity $ 537,400,000 $ 0   $ 0 $ (537,434,000) $ 0  
Debt securities, available-for-sale, realized loss   $ 0   $ 0 256,660,000 0  
Payments to acquire investment securities available for sale     $ 1,480,000,000   $ 2,255,313,000 $ 709,932,000  
Number of investment securities in a loss position for less than twelve months | security   2     2    
Number of investment securities in a loss position for twelve months or longer | security   211     211    
AFS allowance for credit loss   $ 0     $ 0    
Held-to-maturity, allowance for credit loss, measurement input   0     0    
Mortgage-backed securities issued by U.S. Government sponsored enterprises              
Financing Receivable, Impaired [Line Items]              
Debt securities, AFS, sold at amortized cost     1,620,000,000        
Debt securities, available-for-sale, realized loss     $ 256,700,000        
Collateral Pledged              
Financing Receivable, Impaired [Line Items]              
AFS pledged to secure deposits   2,470,000,000     2,470,000,000   $ 5,190,000,000
HTM pledged to secure deposits   $ 2,340,000,000     $ 2,340,000,000