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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Mortgage Servicing Rights [Line Items]
MSRs recognized			$ 52,297	$ 30,962
Mortgage servicing rights
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 22,760	$ 61,606	73,976	$ 76,272
Associated Principal	2,134,271		7,041,235
Mortgage servicing rights | Jumbo MSR Additions
Mortgage Servicing Rights [Line Items]
MSRs recognized	237		8,375
Associated Principal	21,775		883,296
Mortgage servicing rights | Jumbo MSR Additions | Securitization
Mortgage Servicing Rights [Line Items]
MSRs recognized	0		7,874
Associated Principal	0		835,254
Mortgage servicing rights | Jumbo MSR Additions | Loan Sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	237		501
Associated Principal	21,775		48,042
Mortgage servicing rights | Conforming MSR Additions
Mortgage Servicing Rights [Line Items]
MSRs recognized	22,523		65,601
Associated Principal	2,112,496		6,157,939
Mortgage servicing rights | Conforming MSR Additions | Loan Sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	15,201		43,901
Associated Principal	1,384,126		4,085,655
Mortgage servicing rights | Conforming MSR Additions | From purchases
Mortgage Servicing Rights [Line Items]
MSRs recognized	7,322		21,700
Associated Principal	$ 728,370		$ 2,072,284

X

- 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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