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Deposits - Narrative (Details) - USD ($)
$ in Billions
Sep. 30, 2020
Dec. 31, 2019
Schedule of Deposits [Line Items]    
Time Deposits, at or Above FDIC Insurance Limit $ 7.0 $ 8.5
Demand deposits with no defined maturity 23.3  
Deposits, Savings Deposits 22.1  
Program Arranger    
Schedule of Deposits [Line Items]    
Broker network deposit sweeps $ 5.2