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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 40,133,861 | $ 38,359,022
Commercial and Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans | [1] | 2,388,420 | 2,040,574
Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 1,705,308 | 1,377,964
Lease financing, unearned income |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unearned income |  | 53,891 | 65,041
Non-Covered Loans |  | 683,112 | 662,610
Specialty Finance Loans | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 1,900,000 | 1,500,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 469,900,000 | $ 500,800,000
[1] | Includes lease financing receivables, all of which were classified as Pass.

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