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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Billions
12 Months Ended
Dec. 31, 2020
USD ($)
portfolio_segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of portfolio segments | portfolio_segment 2    
Increase (decrease) in allowance for credit losses $ 2.2    
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Increase (decrease) in commercial reserves 1.9    
Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
Increase (decrease) in consumer reserves 0.3    
TDRs      
Financing Receivable, Credit Quality Indicator [Line Items]      
Recorded Investment - Subsequently defaulted TDRs 0.1 $ 0.1 $ 0.1
Nonperforming | TDRs      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 0.9 0.9  
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 0.7 0.8  
Federal Reserve Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral for the ability to borrow 30.1 16.9  
Federal Home Loan Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral for the ability to borrow $ 69.0 $ 68.0