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Off-Balance-Sheet Originate Loans and Letters of Credit (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Line Items]
Commitments	$ 2,400,463
Total mortgage loan commitments
Commitments and Contingencies Disclosure [Line Items]
Commitments	905,173
Total mortgage loan commitments | Multifamily and Commercial Real Estate
Commitments and Contingencies Disclosure [Line Items]
Commitments	316,709
Total mortgage loan commitments | One-to-four family
Commitments and Contingencies Disclosure [Line Items]
Commitments	271,230
Total mortgage loan commitments | Acquisition, Development and Construction
Commitments and Contingencies Disclosure [Line Items]
Commitments	317,234
Other loan commitments
Commitments and Contingencies Disclosure [Line Items]
Commitments	1,171,002
Total loans
Commitments and Contingencies Disclosure [Line Items]
Commitments	2,076,175	$ 2,800,000
Commercial, performance stand-by, and financial stand-by letters of credit
Commitments and Contingencies Disclosure [Line Items]
Commitments	$ 324,288	$ 296,500

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- Definition

Commitments and Contingencies Disclosure [Line Items]

+ References

No definition available.

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- Definition

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

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