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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Mortgage Servicing Rights [Line Items]
MSRs recognized			$ 7,387	$ 7,679
MSRs
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 256	$ 3,443	7,957	$ 22,941
Associated Principal	41,263		781,858
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	256		571
Associated Principal	$ 41,263		$ 95,595

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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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