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Composition of Loan Portfolio (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | [1] | Dec. 31, 2016 | [1]
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 38,859,854 | $ 38,359,022 |  |
Net deferred loan origination costs |  | $ 29,569 | $ 28,949 |  |
Percent of loans held for investment |  | 100.00% | 100.00% |  |
Allowance for losses on non-covered loans |  | $ (161,140) | $ (158,046) | $ (154,450) | $ (158,290)
Loans held for investment, net |  | 38,728,283 | 38,229,925 |  |
Loans held for sale |  | 31,402 | 35,258 |  |
Total loans, net |  | 38,759,685 | 38,265,183 |  |
Commercial and Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment | [2] | 2,035,030 | 2,040,574 |  |
Commercial and Industrial | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 1,377,766 | $ 1,377,964 |  |
Percent of loans held for investment |  | 3.55% | 3.59% |  |
Multi-Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 28,656,234 | $ 28,074,709 |  |
Percent of loans held for investment |  | 73.74% | 73.19% |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 7,252,889 | $ 7,322,226 |  |
Percent of loans held for investment |  | 18.66% | 19.09% |  |
One-to-four family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 465,704 | $ 477,228 |  |
Percent of loans held for investment |  | 1.20% | 1.24% |  |
Acquisition, Development and Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 441,767 | $ 435,825 |  |
Percent of loans held for investment |  | 1.14% | 1.14% |  |
Mortgage Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 36,816,594 | $ 36,309,988 |  |
Percent of loans held for investment |  | 94.74% | 94.66% |  |
Allowance for losses on non-covered loans |  | $ (129,135) | $ (128,275) | $ (121,852) | $ (125,416)
Lease financing, unearned income |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 657,264 | $ 662,610 |  |
Percent of loans held for investment |  | 1.69% | 1.73% |  |
Other Commercial and Industrial Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment | [3] | $ 2,035,030 | $ 2,040,574 |  |
Percent of loans held for investment | [3] | 5.24% | 5.32% |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 8,230 | $ 8,460 |  |
Percent of loans held for investment |  | 0.02% | 0.02% |  |
Total Other Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 2,043,260 | $ 2,049,034 |  |
Total Other Loans | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for Investment |  | $ 2,043,260 | $ 2,049,034 |  |
Percent of loans held for investment |  | 5.26% | 5.34% |  |
[1] | Represents allowance for losses on non-covered loans, excluding PCI loans.
[2] | Includes lease financing receivables, all of which were classified as Pass.
[3] | Includes specialty finance loans of $1.5 billion at March 31, 2018 and December 31, 2017, and other C&I loans of $522.0 million and $500.8 million, respectively, at March 31, 2018 and December 31, 2017.

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