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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 40,487,430 | $ 40,133,861
Multi-Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 29,932,829 | 29,883,919
Multi-Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 29,671,752 | 29,548,242
Multi-Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 232,295 | 312,025
Multi-Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 28,782 | 23,652
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,079,241 | 6,998,834
Commercial Real Estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,944,249 | 6,880,105
Commercial Real Estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 63,529 | 90,653
Commercial Real Estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 71,463 | 28,076
One-to-four family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 435,686 | 446,094
One-to-four family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 432,380 | 444,443
One-to-four family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,669 |
One-to-four family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,637 | 1,651
Acquisition, development, and construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 326,634 | 407,870
Acquisition, development, and construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 276,666 | 319,001
Acquisition, development, and construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 36,825 | 73,964
Acquisition, development, and construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 13,143 | 14,905
Mortgage Receivable |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 37,774,390 | 37,736,717
Mortgage Receivable | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 37,325,047 | 37,191,791
Mortgage Receivable | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 334,318 | 476,642
Mortgage Receivable | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 115,025 | 68,284
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1],[2] | 2,705,064 | 2,388,420
Commercial and Industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 2,628,058 | 2,306,563
Commercial and Industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 3,722 | 19,751
Commercial and Industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 73,284 | 62,106
Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,976 | 8,724
Other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,717 | 8,469
Other | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 259 | 255
Total Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,713,040 | 2,397,144
Total Other Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,635,775 | 2,315,032
Total Other Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 3,722 | 19,751
Total Other Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 73,543 | $ 62,361
[1] | Includes lease financing receivables, all of which were classified as Pass.
[2] | Includes specialty finance loans and leases of $2.2 billion and $1.9 billion, respectively, at March 31, 2019 and December 31, 2018 and other C&I loans of $477.5 million and $469.9 million, respectively, at March 31, 2019 and December 31, 2018.

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