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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | $ 35,732,145 |  |
Multi-Family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | 25,971,629 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | 7,857,204 |  |
One-to-four family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | 116,841 |  |
Acquisition, Development and Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | 311,676 |  |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans | [1] | 1,450,556 |  |
Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-Covered Loans |  | 24,239 |  |
Non-Covered Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 46,825 | [2] | $ 76,950
Total Past Due |  | 53,430 |  | 83,142
Current |  | 35,678,715 |  | 32,921,219
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Past Due |  | 6,605 |  | 6,192
Non-Covered Loans | Multi-Family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 13,904 | [2] | 31,089
Total Past Due |  | 18,722 |  | 31,553
Current |  | 25,952,907 |  | 23,800,293
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Past Due |  | 4,818 |  | 464
Non-Covered Loans | Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 14,920 | [2] | 24,824
Total Past Due |  | 15,098 |  | 26,288
Current |  | 7,842,106 |  | 7,608,032
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 |  | 1,464
Non-Covered Loans | One-to-four family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 12,259 | [2] | 11,032
Total Past Due |  | 13,376 |  | 14,118
Current |  | 103,465 |  | 124,797
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 |  | 1,117 |  | 3,086
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 27 | [2] | 654
Total Past Due |  | 27 |  | 654
Current |  | 311,649 |  | 257,462
Non-Covered Loans | Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual | [1] | 4,473 | [2] | 8,382
Total Past Due | [1] | 4,473 |  | 8,912
Current | [1] | 1,446,083 |  | 1,100,309
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] |  |  | 530
Non-Covered Loans | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non- Accrual |  | 1,242 | [2] | 969
Total Past Due |  | 1,734 |  | 1,617
Current |  | 22,505 |  | 30,326
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total Past Due |  | $ 492 |  | $ 648
[1] | Includes lease financing receivables, all of which were current.
[2] | Excludes $969,000 of non-covered PCI loans that were 90 days or more past due.

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