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Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 37,304,853 | $ 37,356,201 |  |
Net deferred loan origination costs |  | $ 25,636 | $ 26,521 |  |
Non-Covered Loans, Percentage |  | 100.00% | 100.00% |  |
Allowance for losses on non-covered loans |  | $ (154,450) | $ (158,290) | $ (150,778) | $ (147,124)
Non-covered loans held for investment, net |  | 37,176,039 | 37,224,432 |  |
Covered loans |  | 1,599,101 | 1,698,133 |  |
Allowance for losses on covered loans |  | (17,906) | (23,701) | (28,498) | (31,395)
Covered loans, net |  | 1,581,195 | 1,674,432 |  |
Loans held for sale |  | 215,981 | 409,152 |  |
Total loans, net |  | 38,973,215 | 39,308,016 |  |
Commercial and Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | 1,911,635 | 1,900,445 |  |
Commercial and Industrial | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,348,391 | $ 1,341,216 |  |
Non-Covered Loans, Percentage |  | 3.61% | 3.59% |  |
Multi-Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 27,036,909 | $ 26,945,052 |  |
Non-Covered Loans, Percentage |  | 72.47% | 72.13% |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 7,533,380 | $ 7,724,362 |  |
Non-Covered Loans, Percentage |  | 20.19% | 20.68% |  |
One-to-four family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 416,983 | $ 381,081 |  |
Non-Covered Loans, Percentage |  | 1.12% | 1.02% |  |
Covered loans |  | $ 1,531,872 |  |  |
Acquisition, Development and Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 383,001 | $ 381,194 |  |
Non-Covered Loans, Percentage |  | 1.03% | 1.02% |  |
Mortgage Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 35,370,273 | $ 35,431,689 |  |
Non-Covered Loans, Percentage |  | 94.81% | 94.85% |  |
Allowance for losses on non-covered loans |  | $ (121,852) | $ (125,416) | $ (126,185) | $ (124,478)
Lease financing, unearned income |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 563,244 | $ 559,229 |  |
Non-Covered Loans, Percentage |  | 1.51% | 1.50% |  |
Other Commercial and Industrial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | $ 1,911,635 | $ 1,900,445 |  |
Non-Covered Loans, Percentage |  | 5.12% | 5.09% |  |
Purchased Credit-Impaired Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 5,840 | $ 5,762 |  |
Non-Covered Loans, Percentage |  | 0.02% | 0.01% |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 17,105 | $ 18,305 |  |
Non-Covered Loans, Percentage |  | 0.05% | 0.05% |  |
Total Other Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,928,740 | $ 1,918,750 |  |
Total Other Loans | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,934,580 | $ 1,924,512 |  |
Non-Covered Loans, Percentage |  | 5.19% | 5.15% |  |
[1] | Includes lease financing receivables, all of which were classified as "pass."
[2] | Includes specialty finance loans of $1.3 billion at both March 31, 2017 and December 31, 2016, and other commercial and industrial loans of $629.6 million and $632.9 million, respectively, at March 31, 2017 and December 31, 2016.

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