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Loans and Leases - Information Regarding Troubled Debt Restructurings (Details) - Non-Covered Loans - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		$ 31	$ 34
Multi-Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		7
Commercial Real Estate
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		15	15
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	[1]	9	19
Accruing
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		15	15
Accruing | Commercial Real Estate
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		15	15
Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		16	19
Non-Accrual | Multi-Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		7
Non-Accrual | Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	[1]	$ 9	$ 19
[1] Includes $9 million and $18 million of taxi medallion-related loans at June 30, 2021 and December 31, 2020, respectively

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Amount of financing receivable modified as troubled debt restructuring.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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