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Loans and Leases - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Investment | Sep. 30, 2020 USD ($) Investment | Dec. 31, 2020 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  | $ 7 |  | $ 38
Delinquent loans selectively extended to certain borrowers, rate reductions and/or extension of maturity dates |  | $ 12 | $ 23 |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions and/or extension of maturity dates | $ 5 |  | $ 8 |
Number of financing receivable contracts modified as TDRs within previous 12 months, with payment default | Investment |  | 0 | 43 |
Loan classified as non accrual TDRs | $ 6 |  | $ 6 |
Financing Receivable Troubled Debt Restructurings Rate Reductions |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions and/or extension of maturity dates |  | $ 33 |  |

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