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Pledged Assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged $ 41,800,000,000   $ 41,800,000,000   $ 39,600,000,000
Securities eligible to be repledged or sold 259,100,000   259,100,000   151,500,000
Fair value of accepted collateral 275,000,000.0   275,000,000.0   426,200,000
Amount of securities re pledged or sold collateral 0   0   0
Average deposits maintained to meet Federal Reserve Bank reserve requirements 1,600,000,000 $ 1,700,000,000 1,500,000,000 $ 1,700,000,000  
US Government Agencies Debt Securities and Other Securities          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 33,500,000,000   33,500,000,000   30,900,000,000
Obligations of States and Political Subdivisions          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 423,300,000   423,300,000   640,400,000
Loans          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 7,900,000,000   7,900,000,000   8,100,000,000
Collateral Requirements          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 9,200,000,000   9,200,000,000   9,300,000,000
Available for Sale Debt Securities          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 259,000,000.0   259,000,000.0   151,500,000
Repurchase Agreements          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Amount of securities and loans pledged 18,500,000   18,500,000   29,000,000.0
Fair value of accepted collateral 250,000,000.0   250,000,000.0   605,000,000.0
Derivative contract          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Fair value of accepted collateral 23,600,000   23,600,000   15,300,000
Amount of securities re pledged or sold collateral $ 0   $ 0   $ 0