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Quality of Loans (Excluding PCI Loans) (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 38,859,854 |  | $ 38,359,022 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 28,656,234 |  | 28,074,709 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,252,889 |  | 7,322,226 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 465,704 |  | 477,228 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 441,767 |  | 435,825 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 2,035,030 | [1],[2] | 2,040,574 | [3],[4]
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 8,230 |  | 8,460 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 73,386 | [2] | 73,682 | [1]
Total Past Due |  | 83,737 |  | 91,471 |
Current |  | 38,776,117 |  | 38,267,551 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 10,351 | [2] | 17,789 | [1]
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 11,881 | [2] | 11,078 | [1]
Total Past Due |  | 11,881 |  | 12,336 |
Current |  | 28,644,353 |  | 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] |  |  | 1,258 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 13,611 | [2] | 6,659 | [1]
Total Past Due |  | 16,802 |  | 19,886 |
Current |  | 7,236,087 |  | 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 |  | 3,191 | [2] | 13,227 | [1]
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 1,949 | [2] | 1,966 | [1]
Total Past Due |  | 2,346 |  | 2,551 |
Current |  | 463,358 |  | 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 |  | 397 | [2] | 585 | [1]
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [1] |  |  | 6,200 |
Total Past Due |  |  |  | 6,200 |
Current |  | 441,767 |  | 429,625 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [1] | 45,941 | [2] | 47,768 | [3],[4]
Total Past Due |  | 52,677 | [1],[2] | 50,479 | [3],[4]
Current |  | 1,982,353 | [1],[2] | 1,990,095 | [3],[4]
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] | 6,736 | [2] | 2,711 | [3],[4]
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 4 | [2] | 11 | [1]
Total Past Due |  | 31 |  | 19 |
Current |  | 8,199 |  | 8,441 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 27 | [2] | $ 8 | [1]
[1] | (2) Includes lease financing receivables, all of which were current.
[2] | Includes $6.7 million and $44.8million of taxi medallion-related loans that were 30 to 89 days past due and 90 days or more past due, respectively.
[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.
[4] | Includes lease financing receivables, all of which were current.

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- Definition Loans And Leases Receivable Gross Carrying Amount Excluding Purchased Credit Impaired Loans + References No definition available. + Details
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