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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 38,359,022 |  | $ 37,350,439 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 28,074,709 |  | 26,945,052 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,322,226 |  | 7,724,362 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 477,228 |  | 381,081 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 435,825 |  | 381,194 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | 2,040,574 | [1] | 1,900,445 | [3]
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 8,460 |  | 18,305 | [4]
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 91,471 |  | 66,852 |
Non- Accrual | [2] | 73,682 |  | 56,469 |
Current |  | 38,267,551 |  | 37,283,587 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | 17,789 |  | 10,383 |
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 12,336 |  | 13,586 |
Non- Accrual | [2] | 11,078 |  | 13,558 |
Current |  | 28,062,373 |  | 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 | [2] | 1,258 |  | 28 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19,886 |  | 9,297 |
Non- Accrual | [2] | 6,659 |  | 9,297 |
Current |  | 7,302,340 |  | 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 | [2] | 13,227 |  |  |
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,551 |  | 12,523 |
Non- Accrual | [2] | 1,966 |  | 9,679 |
Current |  | 474,677 |  | 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 | [2] | 585 |  | 2,844 |
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,200 |  | 6,200 |
Non- Accrual | [2] | 6,200 |  | 6,200 |
Current |  | 429,625 |  | 374,994 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | 50,479 | [1] | 23,685 | [3]
Non- Accrual | [2] | 47,768 | [1] | 16,422 | [3]
Current | [2] | 1,990,095 | [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] | 2,711 | [1] | 7,263 | [3]
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 19 |  | 1,561 | [4]
Non- Accrual | [2] | 11 |  | 1,313 | [4]
Current |  | 8,441 |  | 16,744 | [4]
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | $ 8 |  | $ 248 | [4]
[1] | (1) Includes $2.7 million and $46.7 million of taxi medallion-related loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[2] | (2) Includes lease financing receivables, all of which were current.
[3] | (1) 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, resp
[4] | (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.

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