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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 37,304,853	$ 37,356,201
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		27,036,909	26,945,052
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		26,865,172	26,754,622
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		160,329	164,325
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		11,408	26,105
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,533,380	7,724,362
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,516,823	7,701,773
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		12,550	12,604
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		4,007	9,985
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		416,983	381,081
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		406,669	371,179
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		10,314	9,902
Acquisition, Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		383,001	381,194
Acquisition, Development and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		334,112	341,784
Acquisition, Development and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		42,689	33,210
Acquisition, Development and Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,200	6,200
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		35,370,273	35,431,689
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		35,122,776	35,169,358
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		215,568	210,139
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		31,929	52,192
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,911,635	1,900,445
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,785,111	1,771,975
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	41,573	54,979
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	84,951	73,491
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		17,105	18,305
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		15,788	16,992
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,317	1,313
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,928,740	1,918,750
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,800,899	1,788,967
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		41,573	54,979
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 86,268	$ 74,804
[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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