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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Mortgage Servicing Rights [Line Items]
MSRs recognized			$ 5,688	$ 36,834
Mortgage servicing rights
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 10,691	$ 32,463	19,498	$ 51,217
Associated Principal	1,187,171		2,057,242
Mortgage servicing rights | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSRs recognized	2,209		2,255
Associated Principal	321,215		327,734
Mortgage servicing rights | Jumbo Loan | From securitizations
Mortgage Servicing Rights [Line Items]
MSRs recognized	2,131		2,131
Associated Principal	310,242		310,242
Mortgage servicing rights | Jumbo Loan | Loan Sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	78		124
Associated Principal	10,973		17,492
Mortgage servicing rights | Conforming Loan
Mortgage Servicing Rights [Line Items]
MSRs recognized	8,482		17,243
Associated Principal	865,956		1,729,508
Mortgage servicing rights | Conforming Loan | Loan Sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	16		3,380
Associated Principal	1,772		316,290
Mortgage servicing rights | Conforming Loan | From purchases
Mortgage Servicing Rights [Line Items]
MSRs recognized	8,466		13,863
Associated Principal	$ 864,184		$ 1,413,218

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- Definition

Mortgage Servicing Rights [Line Items]

+ References

No definition available.

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- Definition

Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122625-111746

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