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Composition of Loan Portfolio (Detail) - USD ($)
$ in Thousands

Sep. 30, 2018

Dec. 31, 2017

Sep. 30, 2017

Dec. 31, 2016

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 39,806,031

$ 38,359,022

Net deferred loan origination costs

$ 32,240

$ 28,949

Percent of loans held for investment

100.00%

100.00%

Allowance for losses on non-covered loans

$ (159,655)

$ (158,046)

$ (158,918)

$ (158,290)

Loans held for investment, net

39,678,616

38,229,925

Loans held for sale

35,258

Total loans, net

39,678,616

38,265,183

Commercial and Industrial

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

^[1]

2,326,679

2,040,574

Commercial and Industrial | Other loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 1,622,983

$ 1,377,964

Percent of loans held for investment

4.08%

3.59%

Multi-Family

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 29,546,399

$ 28,074,709

Percent of loans held for investment

74.22%

73.19%

Commercial Real Estate

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 7,033,629

$ 7,322,226

Percent of loans held for investment

17.67%

19.09%

One-to-four family

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 456,317

$ 477,228

Percent of loans held for investment

1.15%

1.24%

Acquisition, Development and Construction

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 433,976

$ 435,825

Percent of loans held for investment

1.09%

1.14%

Mortgage Receivable

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 37,470,321

$ 36,309,988

Percent of loans held for investment

94.13%

94.66%

Allowance for losses on non-covered loans

$ (128,816)

$ (128,275)

$ (122,522)

$ (125,416)

Lease financing, unearned income

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 703,696

$ 662,610

Percent of loans held for investment

1.77%

1.73%

Other Commercial and Industrial Loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

^[2]

$ 2,326,679

$ 2,040,574

Percent of loans held for investment

5.85%

5.32%

Other

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 9,031

$ 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

$ 2,335,710

$ 2,049,034

Total Other Loans | Other loans

Accounts, Notes, Loans and Financing Receivable [Line Items]

Loans Held for Investment

$ 2,335,710

$ 2,049,034

Percent of loans held for investment

5.87%

5.34%

[1]	Includes lease financing receivables, all of which were classified as Pass.
[2]	Includes specialty finance loans and leases of $1.8 billion at September 30, 2018 and $1.5 billion at December 31, 2017, and other C&I loans of $482.4 million and $500.8 million, respectively, at September 30, 2018 and December 31, 2017.

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