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Loans and Leases - Information Regarding Troubled Debt Restructurings (Parenthetical) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Taxi Medallion Loans |  |
Financing Receivable Modifications [Line Items] |  |
Troubled debt restructurings | $ 7 | $ 18

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