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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Billions | 12 Months Ended
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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 |

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