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Quality of Non-Covered Loans (Excluding PCI Loans and Leases) (Parenthetical) (Detail) - Taxi Medallion Loans - Commercial and Industrial - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 483,000 | $ 530,000
Loans 90 Days Or More Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 33,600 | $ 35,500

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