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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Mortgage Servicing Rights [Line Items]
MSRs recognized			$ 7,387	$ 5,688
MSRs
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 216	$ 10,691	7,701	$ 19,498
Associated Principal	35,261		740,595
MSRs | Jumbo Loans
Mortgage Servicing Rights [Line Items]
MSRs recognized	0		7,386
Associated Principal	0		686,263
MSRs | Jumbo Loans | From securitization
Mortgage Servicing Rights [Line Items]
MSRs recognized	0		7,123
Associated Principal	0		654,605
MSRs | Jumbo Loans | From loan sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	0		263
Associated Principal	0		31,658
MSRs | Conforming Loans | From purchases
Mortgage Servicing Rights [Line Items]
MSRs recognized	216		315
Associated Principal	$ 35,261		$ 54,332

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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=68078379&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=68078379&loc=d3e122625-111746

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