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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 37,356,201	$ 35,740,489
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,945,052	25,971,629
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,754,622	25,936,423
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		164,325	6,305
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,105	28,901
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,724,362	7,857,204
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,701,773	7,839,127
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		12,604	3,883
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		9,985	14,194
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		381,081	116,841
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		371,179	104,582
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		9,902	12,259
Acquisition, Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		381,194	311,676
Acquisition, Development and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		341,784	309,039
Acquisition, Development and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		33,210
Acquisition, Development and Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,200	2,637
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		35,431,689	34,257,350
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		35,169,358	34,189,171
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		210,139	10,188
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		52,192	57,991
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,900,445	1,450,556
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,771,975	1,433,778
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	54,979	11,771
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	73,491	5,007
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		18,305	24,239
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		16,992	22,996
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,313	1,243
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,918,750	1,474,795
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,788,967	1,456,774
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		54,979	11,771
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 74,804	$ 6,250
[1] Includes lease financing receivables, all of which were classified as "pass."

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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