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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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Amount, after troubled debt restructuring, of modified financing receivable.

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