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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 37,335,541 | $ 35,740,489
Multi-Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 27,066,459 | 25,971,629
Multi-Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 26,768,006 | 25,936,423
Multi-Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 271,366 | 6,305
Multi-Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 27,087 | 28,901
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,764,241 | 7,857,204
Commercial Real Estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,739,061 | 7,839,127
Commercial Real Estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 14,452 | 3,883
Commercial Real Estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 10,728 | 14,194
One-to-four family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 331,617 | 116,841
One-to-four family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 321,827 | 104,582
One-to-four family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 9,790 | 12,259
Acquisition, Development and Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 372,199 | 311,676
Acquisition, Development and Construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 348,789 | 309,039
Acquisition, Development and Construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 17,210 |
Acquisition, Development and Construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,200 | 2,637
Mortgage Receivable |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 35,534,516 | 34,257,350
Mortgage Receivable | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 35,177,683 | 34,189,171
Mortgage Receivable | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 303,028 | 10,188
Mortgage Receivable | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 53,805 | 57,991
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 1,775,295 | 1,450,556
Commercial and Industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 1,681,841 | 1,433,778
Commercial and Industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 32,156 | 11,771
Commercial and Industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 61,298 | 5,007
Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 19,791 | 24,239
Other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 18,423 | 22,996
Other | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,368 | 1,243
Total Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,795,086 | 1,474,795
Total Other Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,700,264 | 1,456,774
Total Other Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 32,156 | 11,771
Total Other Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 62,666 | $ 6,250
[1] | Includes lease financing receivables, all of which were classified as "pass."

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