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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 41,844,019 | $ 40,133,861
Multi-Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 31,158,672 | 29,883,919
Multi-Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 30,903,657 | 29,548,242
Multi-Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 239,664 | 312,025
Multi-Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 15,351 | 23,652
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,081,910 | 6,998,834
Commercial Real Estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,902,218 | 6,880,105
Commercial Real Estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 104,648 | 90,653
Commercial Real Estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 75,044 | 28,076
One-to-four family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 380,361 | 446,094
One-to-four family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 377,883 | 444,443
One-to-four family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 748 |
One-to-four family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,730 | 1,651
Acquisition, development, and construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 200,596 | 407,870
Acquisition, development, and construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 158,751 | 319,001
Acquisition, development, and construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 41,456 | 73,964
Acquisition, development, and construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 389 | 14,905
Mortgage Receivable |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 38,821,539 | 37,736,717
Mortgage Receivable | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 38,342,509 | 37,191,791
Mortgage Receivable | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 386,516 | 476,642
Mortgage Receivable | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 92,514 | 68,284
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 3,014,378 | 2,388,420
Commercial and Industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,960,557 | 2,306,563
Commercial and Industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,588 | 19,751
Commercial and Industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 52,233 | 62,106
Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 8,102 | 8,724
Other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 7,850 | 8,469
Other | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 252 | 255
Total Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 3,022,480 | 2,397,144
Total Other Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,968,407 | 2,315,032
Total Other Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,588 | 19,751
Total Other Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 52,485 | $ 62,361
[1] | Includes specialty finance loans and leases of $0.0 billion and $1.9 billion, respectively, at December 30, 2019 and 2018. Other C&I loans of $000.0 million and $469.9 million, respectively, at December 30, 2019 and 2018.

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