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Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 36,778,401 | $ 35,740,489 |  |
Net deferred loan origination costs |  | 22,129 | 22,715 |  |
Allowance for losses on non-covered loans |  | (153,059) | (147,124) | $ (141,348) | $ (139,857)
Non-covered loans held for investment, net |  | 36,647,471 | 35,616,080 |  |
Covered loans |  | 1,890,883 | 2,060,089 |  |
Allowance for losses on covered loans |  | (26,649) | (31,395) | (46,148) | (45,481)
Covered loans, net |  | 1,864,234 | 2,028,694 |  |
Loans held for sale |  | 609,894 | 367,221 |  |
Total loans, net |  | $ 39,121,599 | $ 38,011,995 |  |
Non-Covered Loans, Percentage |  | 100.00% | 100.00% |  |
Multi-Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 26,750,593 | $ 25,971,629 |  |
Non-Covered Loans, Percentage |  | 72.73% | 72.67% |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 7,793,610 | $ 7,857,204 |  |
Non-Covered Loans, Percentage |  | 21.19% | 21.98% |  |
Acquisition, Development and Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 361,523 | $ 311,676 |  |
Non-Covered Loans, Percentage |  | 0.98% | 0.87% |  |
One-to-four family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 246,183 | $ 116,841 |  |
Covered loans |  | $ 1,775,616 |  |  |
Non-Covered Loans, Percentage |  | 0.67% | 0.33% |  |
Mortgage Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 35,151,909 | $ 34,257,350 |  |
Allowance for losses on non-covered loans |  | $ (128,696) | $ (124,478) | $ (117,695) | $ (122,616)
Non-Covered Loans, Percentage |  | 95.57% | 95.85% |  |
Commercial and Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | $ 1,599,227 | $ 1,450,556 |  |
Commercial and Industrial | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,174,180 | $ 1,085,529 |  |
Non-Covered Loans, Percentage |  | 3.19% | 3.04% |  |
Lease financing, unearned income |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 425,047 | $ 365,027 |  |
Non-Covered Loans, Percentage |  | 1.16% | 1.02% |  |
Other Commercial and Industrial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | $ 1,599,227 | $ 1,450,556 |  |
Non-Covered Loans, Percentage | [2] | 4.35% | 4.06% |  |
Purchased Credit-Impaired Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 5,983 | $ 8,344 |  |
Non-Covered Loans, Percentage |  | 0.02% | 0.02% |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 21,282 | $ 24,239 |  |
Non-Covered Loans, Percentage |  | 0.06% | 0.07% |  |
Total Other Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,620,509 | $ 1,474,795 |  |
Total Other Loans | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,626,492 | $ 1,483,139 |  |
Non-Covered Loans, Percentage |  | 4.43% | 4.15% |  |
[1] | Includes lease financing receivables, all of which were classified as "pass."
[2] | Includes specialty finance loans of $1.0 billion and $880.7 million and other C&I loans of $592.4 million and $569.9 million, respectively, at June 30, 2016 and December 31, 2015.

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