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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 38,359,022 | $ 37,356,201
Multi-Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 28,074,709 | 26,945,052
Multi-Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 27,874,330 | 26,754,622
Multi-Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 125,752 | 164,325
Multi-Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 74,627 | 26,105
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,322,226 | 7,724,362
Commercial Real Estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,255,100 | 7,701,773
Commercial Real Estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 47,123 | 12,604
Commercial Real Estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 20,003 | 9,985
One-to-four family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 477,228 | 381,081
One-to-four family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 471,571 | 371,179
One-to-four family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 3,691 |
One-to-four family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,966 | 9,902
Acquisition, Development and Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 435,825 | 381,194
Acquisition, Development and Construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 344,040 | 341,784
Acquisition, Development and Construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 76,033 | 33,210
Acquisition, Development and Construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 15,752 | 6,200
Mortgage Receivable |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 36,309,988 | 35,431,689
Mortgage Receivable | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 35,945,041 | 35,169,358
Mortgage Receivable | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 252,599 | 210,139
Mortgage Receivable | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 112,348 | 52,192
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 2,040,574 | 1,900,445
Commercial and Industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 1,925,527 | 1,771,975
Commercial and Industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 20,883 | 54,979
Commercial and Industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 94,164 | 73,491
Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 8,460 | 18,305
Other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 8,449 | 16,992
Other | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 11 | 1,313
Total Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,049,034 | 1,918,750
Total Other Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,933,976 | 1,788,967
Total Other Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 20,883 | 54,979
Total Other Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 94,175 | $ 74,804
[1] | (1) Includes lease financing receivables, all of which were classified as "pass."

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