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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 36,153,668	$ 35,740,489
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,406,585	25,971,629
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,371,966	25,936,423
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		5,992	6,305
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		28,627	28,901
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,676,793	7,857,204
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,635,582	7,839,127
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		30,058	3,883
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		11,153	14,194
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		186,033	116,841
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		174,862	104,582
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		11,171	12,259
Acquisition, Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		344,645	311,676
Acquisition, Development and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		343,835	309,039
Acquisition, Development and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		810
Acquisition, Development and Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans			2,637
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		34,614,056	34,257,350
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		34,526,245	34,189,171
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		36,860	10,188
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		50,951	57,991
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,510,509	1,450,556
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,483,734	1,433,778
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,632	11,771
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	25,143	5,007
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		22,629	24,239
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		21,271	22,996
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,358	1,243
Total Other Loan Segment
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,533,138	1,474,795
Total Other Loan Segment | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,505,005	1,456,774
Total Other Loan Segment | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,632	11,771
Total Other Loan Segment | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 26,501	$ 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=28367877&loc=d3e4428-111522

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