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Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 40,133,861 | $ 38,359,022 |
Net deferred loan origination costs |  | 32,047 | 28,949 |
Allowance for losses |  | (159,820) | (158,046) | $ (158,290)
Loans held for investment, net |  | 40,006,088 | 38,229,925 |
Loans held for sale |  |  | 35,258 |
Total loans, net |  | $ 40,006,088 | $ 38,265,183 |
Non-Covered Loans, Percentage |  | 100.00% | 100.00% |
Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans | [1] | $ 2,388,420 | $ 2,040,574 |
Commercial and Industrial | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 1,705,308 | $ 1,377,964 |
Non-Covered Loans, Percentage |  | 4.25% | 3.59% |
Multi-Family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 29,883,919 | $ 28,074,709 |
Non-Covered Loans, Percentage |  | 74.46% | 73.19% |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 6,998,834 | $ 7,322,226 |
Non-Covered Loans, Percentage |  | 17.44% | 19.09% |
One-to-four family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 446,094 | $ 477,228 |
Non-Covered Loans, Percentage |  | 1.11% | 1.24% |
Acquisition, development, and construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 407,870 | $ 435,825 |
Non-Covered Loans, Percentage |  | 1.02% | 1.14% |
Mortgage Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 37,736,717 | $ 36,309,988 |
Allowance for losses |  | $ (130,983) | $ (128,275) | $ (125,416)
Non-Covered Loans, Percentage |  | 94.03% | 94.66% |
Lease financing, unearned income |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 683,112 | $ 662,610 |
Non-Covered Loans, Percentage |  | 1.70% | 1.73% |
Other Commercial and Industrial Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans | [2] | $ 2,388,420 | $ 2,040,574 |
Non-Covered Loans, Percentage | [2] | 5.95% | 5.32% |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 8,724 | $ 8,460 |
Non-Covered Loans, Percentage |  | 0.02% | 0.02% |
Total Other Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 2,397,144 | $ 2,049,034 |
Total Other Loans | Other loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 2,397,144 | $ 2,049,034 |
Non-Covered Loans, Percentage |  | 5.97% | 5.34% |
[1] | Includes lease financing receivables, all of which were classified as Pass.
[2] | Includes specialty finance loans and leases of $1.9 billion and $1.5 billion, respectively, at December 31, 2018 and 2017. Other C&I loans of $469.9 million and $500.8 million, respectively, at December 31, 2018 and 2017.

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