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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 37,329,602 |  | $ 35,732,145 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 27,066,459 |  | 25,971,629 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,764,241 |  | 7,857,204 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 331,617 |  | 116,841 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 372,199 |  | 311,676 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | 1,775,295 |  | 1,450,556 |
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 19,791 |  | 24,239 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 43,401 | [2] | 46,825 | [3]
Total Past Due |  | 69,973 |  | 53,430 |
Current |  | 37,259,629 |  | 35,678,715 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 26,572 | [2] | 6,605 |
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 10,769 | [2] | 13,904 | [3]
Total Past Due |  | 13,717 |  | 18,722 |
Current |  | 27,052,742 |  | 25,952,907 |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,948 | [2] | 4,818 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 10,628 | [2] | 14,920 | [3]
Total Past Due |  | 10,628 |  | 15,098 |
Current |  | 7,753,613 |  | 7,842,106 |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 178 |
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 9,790 | [2] | 12,259 | [3]
Total Past Due |  | 11,285 |  | 13,376 |
Current |  | 320,332 |  | 103,465 |
Non-Covered Loans | One-to-four family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,495 | [2] | 1,117 |
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [3] |  |  | 27 |
Total Past Due |  | 6,200 |  | 27 |
Current |  | 365,999 |  | 311,649 |
Non-Covered Loans | Acquisition, Development and Construction | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | 6,200 |  |  |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [1] | 10,847 | [2] | 4,473 | [3]
Total Past Due | [1] | 26,541 |  | 4,473 |
Current | [1] | 1,748,754 |  | 1,446,083 |
Non-Covered Loans | Commercial and Industrial | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [1],[2] | 15,694 |  |  |
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 1,367 | [2] | 1,242 | [3]
Total Past Due |  | 1,602 |  | 1,734 |
Current |  | 18,189 |  | 22,505 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 235 | [2] | $ 492 |
[1] | Includes lease financing receivables, all of which were current.
[2] | 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.
[3] | Excludes $969,000 of non-covered PCI loans that were 90 days or more past due.

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