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Off-Balance Sheet Outstanding Loan Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Commitments	$ 3,128,329
Total mortgage loan commitments
Commitments and Contingencies Disclosure [Line Items]
Commitments	1,828,608
Total mortgage loan commitments | Multifamily and Commercial Real Estate
Commitments and Contingencies Disclosure [Line Items]
Commitments	1,122,634
Total mortgage loan commitments | One-to-four family
Commitments and Contingencies Disclosure [Line Items]
Commitments	394,912
Total mortgage loan commitments | Acquisition, Development and Construction
Commitments and Contingencies Disclosure [Line Items]
Commitments	311,062
Other loan commitments
Commitments and Contingencies Disclosure [Line Items]
Commitments	1,003,216
Total loans
Commitments and Contingencies Disclosure [Line Items]
Commitments	2,831,824	$ 2,600,000
Commercial, performance stand-by, and financial stand-by letters of credit
Commitments and Contingencies Disclosure [Line Items]
Commitments	$ 296,505

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- Definition

Commitments and Contingencies Disclosure [Line Items]

+ References

No definition available.

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 17
-Article 9

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