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Quality of Non-Covered Loans (Excluding PCI Loans) (Parenthetical) (Detail) - Non-Covered Loans - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 69,973 |  | $ 53,430
Loans 90 Days Or More Past Due | Purchased Credit-Impaired Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 950,000 |  | 969,000
Financing Receivable, 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 26,572 | [1] | $ 6,605
Financing Receivable, 30-89 Days Past Due | Purchased Credit-Impaired Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 4,000 |  |
[1] | Excludes $4,000 and $950,000 of non-covered PCI loans that were 30-89 days past due and 90 days or more past due, respectively.

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