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Quality of Non-Covered Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 40,133,861 |  | $ 38,359,022 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 29,883,919 |  | 28,074,709 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 6,998,834 |  | 7,322,226 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 446,094 |  | 477,228 |
Acquisition, development, and construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 407,870 |  | 435,825 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | 2,388,420 | [1] | 2,040,574 | [3]
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 8,724 |  | 8,460 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 46,070 |  | 91,471 |
Non- Accrual |  | 45,506 |  | 73,682 |
Current |  | 40,087,791 |  | 38,267,551 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 564 |  | 17,789 |
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,220 |  | 12,336 |
Non- Accrual |  | 4,220 |  | 11,078 |
Current |  | 29,879,699 |  | 28,062,373 |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,258 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 3,021 |  | 19,886 |
Non- Accrual |  | 3,021 |  | 6,659 |
Current |  | 6,995,813 |  | 7,302,340 |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 13,227 |
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,660 |  | 2,551 |
Non- Accrual |  | 1,651 |  | 1,966 |
Current |  | 444,434 |  | 474,677 |
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 |  | 9 |  | 585 |
Non-Covered Loans | Acquisition, development, and construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 6,200 |
Non- Accrual |  |  |  | 6,200 |
Current |  | 407,870 |  | 429,625 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due | [2] | 37,138 | [1] | 50,479 | [3]
Non- Accrual | [2] | 36,608 | [1] | 47,768 | [3]
Current | [2] | 2,351,282 | [1] | 1,990,095 | [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] | 530 | [1] | 2,711 | [3]
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 31 |  | 19 |
Non- Accrual |  | 6 |  | 11 |
Current |  | 8,693 |  | 8,441 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 25 |  | $ 8 |
[1] | Includes $530,000 and $35.5 million of 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 $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.

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