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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Mortgage Servicing Rights [Line Items]
MSRs recognized			$ 7,679	$ 52,297
MSRs
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 3,443	$ 22,760	22,941	$ 73,976
Associated Principal	548,281		2,605,523
MSRs | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSRs recognized	1,992		4,247
Associated Principal	331,737		659,471
MSRs | Jumbo Loan | From securitization
Mortgage Servicing Rights [Line Items]
MSRs recognized	1,971		4,102
Associated Principal	328,227		638,469
MSRs | Jumbo Loan | From loan sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	21		145
Associated Principal	3,510		21,002
MSRs | Conforming Loan
Mortgage Servicing Rights [Line Items]
MSRs recognized	1,451		18,694
Associated Principal	216,544		1,946,052
MSRs | Conforming Loan | From loan sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	0		3,380
Associated Principal	0		316,290
MSRs | Conforming Loan | From purchases
Mortgage Servicing Rights [Line Items]
MSRs recognized	1,451		15,314
Associated Principal	$ 216,544		$ 1,629,762

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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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