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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 37,350,439 |  | $ 35,732,145 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 26,945,052 |  | 25,971,629 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,724,362 |  | 7,857,204 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 381,081 |  | 116,841 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 381,194 |  | 311,676 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | 1,900,445 |  | 1,450,556 |
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 18,305 |  | 24,239 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 56,469 | [2] | 46,825 | [3]
Total Past Due |  | 66,852 |  | 53,430 |
Current |  | 37,283,587 |  | 35,678,715 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 10,383 | [2] | 6,605 |
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 13,558 | [2] | 13,904 | [3]
Total Past Due |  | 13,586 |  | 18,722 |
Current |  | 26,931,466 |  | 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 |  | 28 | [2] | 4,818 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 9,297 | [2] | 14,920 | [3]
Total Past Due |  | 9,297 |  | 15,098 |
Current |  | 7,715,065 |  | 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 |  | 9,679 | [2] | 12,259 | [3]
Total Past Due |  | 12,523 |  | 13,376 |
Current |  | 368,558 |  | 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 |  | 2,844 | [2] | 1,117 |
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 6,200 | [2] | 27 | [3]
Total Past Due |  | 6,200 |  | 27 |
Current |  | 374,994 |  | 311,649 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [1] | 16,422 | [2] | 4,473 | [3]
Total Past Due | [1] | 23,685 |  | 4,473 |
Current | [1] | 1,876,760 |  | 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] | 7,263 |  |  |
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 1,313 | [2] | 1,242 | [3]
Total Past Due |  | 1,561 |  | 1,734 |
Current |  | 16,744 |  | 22,505 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 248 | [2] | $ 492 |
[1] | Includes lease financing receivables, all of which were current.
[2] | Excludes $6,000 and $869,000 of non-covered PCI loans that were 30 to 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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