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Deposits (Narrative) (Details) - USD ($)
$ in Billions
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Time Deposits, $100,000 or More $ 4.1  
Time deposit accounts with balances of $250,000 or more 2.4 $ 2.3
Public funds deposits included in deposits 2.6  
Interest-bearing Domestic Deposit, Brokered 2.5  
Carrying value of investment securities available for sale pledged as security for public funds deposits $ 1.3