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Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 37,335,541 | $ 35,740,489 |  |
Net deferred loan origination costs |  | 25,199 | 22,715 |  |
Allowance for losses on non-covered loans |  | (154,705) | (147,124) | $ (146,045) | $ (139,857)
Non-covered loans held for investment, net |  | 37,206,035 | 35,616,080 |  |
Covered loans |  | 1,789,164 | 2,060,089 |  |
Allowance for losses on covered loans |  | (25,360) | (31,395) | (37,632) | (45,481)
Covered loans, net |  | 1,763,804 | 2,028,694 |  |
Loans held for sale |  | 701,398 | 367,221 |  |
Total loans, net |  | $ 39,671,237 | $ 38,011,995 |  |
Non-Covered Loans, Percentage |  | 100.00% | 100.00% |  |
Multi-Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 27,066,459 | $ 25,971,629 |  |
Non-Covered Loans, Percentage |  | 72.49% | 72.67% |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 7,764,241 | $ 7,857,204 |  |
Non-Covered Loans, Percentage |  | 20.80% | 21.98% |  |
Acquisition, Development and Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 372,199 | $ 311,676 |  |
Non-Covered Loans, Percentage |  | 1.00% | 0.87% |  |
One-to-four family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 331,617 | $ 116,841 |  |
Covered loans |  | $ 1,688,148 |  |  |
Non-Covered Loans, Percentage |  | 0.89% | 0.33% |  |
Mortgage Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 35,534,516 | $ 34,257,350 |  |
Allowance for losses on non-covered loans |  | $ (126,234) | $ (124,478) | $ (121,568) | $ (122,616)
Non-Covered Loans, Percentage |  | 95.18% | 95.85% |  |
Commercial and Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | $ 1,775,295 | $ 1,450,556 |  |
Commercial and Industrial | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,301,814 | $ 1,085,529 |  |
Non-Covered Loans, Percentage |  | 3.48% | 3.04% |  |
Lease financing, unearned income |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 473,481 | $ 365,027 |  |
Non-Covered Loans, Percentage |  | 1.27% | 1.02% |  |
Other Commercial and Industrial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | $ 1,775,295 | $ 1,450,556 |  |
Non-Covered Loans, Percentage | [2] | 4.75% | 4.06% |  |
Purchased Credit-Impaired Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 5,939 | $ 8,344 |  |
Non-Covered Loans, Percentage |  | 0.02% | 0.02% |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 19,791 | $ 24,239 |  |
Non-Covered Loans, Percentage |  | 0.05% | 0.07% |  |
Total Other Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,795,086 | $ 1,474,795 |  |
Total Other Loans | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,801,025 | $ 1,483,139 |  |
Non-Covered Loans, Percentage |  | 4.82% | 4.15% |  |
[1] | Includes lease financing receivables, all of which were classified as "pass."
[2] | Includes specialty finance loans of $1.1 billion and $880.7 million, and other C&I loans of $630.7 million and $569.9 million, respectively, at September 30, 2016 and December 31, 2015.

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