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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Mortgage Servicing Rights [Line Items]
MSRs recognized	$ 7,386	$ 3,463
MSRs
Mortgage Servicing Rights [Line Items]
MSRs recognized	7,485	$ 8,807
Associated Principal	705,334
MSRs | Jumbo Loan
Mortgage Servicing Rights [Line Items]
MSRs recognized	7,386
Associated Principal	686,263
MSRs | Jumbo Loan | From securitization
Mortgage Servicing Rights [Line Items]
MSRs recognized	7,123
Associated Principal	654,605
MSRs | Jumbo Loan | From loan sales
Mortgage Servicing Rights [Line Items]
MSRs recognized	263
Associated Principal	31,658
MSRs | Conforming Loan | From purchases
Mortgage Servicing Rights [Line Items]
MSRs recognized	99
Associated Principal	$ 19,071

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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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