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Borrowings - Narrative (Details) - USD ($)
May 06, 2020
Mar. 31, 2021
London Interbank Offered Rate (LIBOR)    
Short-term Debt [Line Items]    
Basis points 5.09%  
FHLB advances    
Short-term Debt [Line Items]    
Loans pledged   $ 13,000,000,000.0
Federal Reserve Bank Advances    
Short-term Debt [Line Items]    
Loans pledged   3,400,000,000
FHLB advances outstanding   $ 0