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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 37,299,013 |  | $ 37,350,439 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 27,036,909 |  | 26,945,052 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,533,380 |  | 7,724,362 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 416,983 |  | 381,081 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 383,001 |  | 381,194 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | 1,911,635 | [1] | 1,900,445 | [3]
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 17,105 |  | 18,305 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 60,144 | [4] | 56,469 | [5]
Total Past Due |  | 76,611 |  | 66,852 |
Current |  | 37,222,402 |  | 37,283,587 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 16,467 | [4] | 10,383 | [5]
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 11,555 | [4] | 13,558 | [5]
Total Past Due |  | 11,563 |  | 13,586 |
Current |  | 27,025,346 |  | 26,931,466 |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8 | [4] | 28 | [5]
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 3,327 | [4] | 9,297 | [5]
Total Past Due |  | 4,529 |  | 9,297 |
Current |  | 7,528,851 |  | 7,715,065 |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [4] | 1,202 |  |  |
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 10,093 | [4] | 9,679 | [5]
Total Past Due |  | 10,885 |  | 12,523 |
Current |  | 406,098 |  | 368,558 |
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 |  | 792 | [4] | 2,844 | [5]
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 6,200 | [4] | 6,200 | [5]
Total Past Due |  | 6,200 |  | 6,200 |
Current |  | 376,801 |  | 374,994 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [2] | 27,652 | [1],[4] | 16,422 | [3],[5]
Total Past Due | [2] | 42,031 | [1] | 23,685 | [3]
Current | [2] | 1,869,604 | [1] | 1,876,760 | [3]
Non-Covered Loans | Commercial and Industrial | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | 14,379 | [1],[4] | 7,263 | [3],[5]
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 1,317 | [4] | 1,313 | [5]
Total Past Due |  | 1,403 |  | 1,561 |
Current |  | 15,702 |  | 16,744 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 86 | [4] | $ 248 | [5]
[1] | Includes $13.3 million and $24.4 million of taxi medallion loans or taxi medallion-related loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[2] | Includes lease financing receivables, all of which were current.
[3] | Includes $6.8 million and $15.2 million of taxi medallion loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[4] | Excludes $4 thousand and $863 thousand of non-covered PCI loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[5] | Excludes $6 thousand and $869 thousand of non-covered PCI loans that were 30 to 89 days past due and 90 days or more past due, respectively.

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