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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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