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Segment Information - Origination Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Information
Origination Volumes	$ 1,376,376	$ 928,181	$ 3,499,569	$ 3,181,367
Loan Sales Data:
Sales margin (fee-based services as a % of loan sales)	1.47%	1.63%	1.57%	1.52%
MSR rate (MSR income as a % of loan commitments)	1.83%	2.04%	1.79%	1.77%
Structured Business
Segment Information
New loan originations	$ 287,480	$ 473,171	$ 1,208,550	$ 1,057,004
Loan payoffs / paydowns	255,575	270,010	684,216	723,977
Agency Business
Segment Information
Origination Volumes	1,411,064	996,722	3,500,182	3,307,874
Loan Sales Data:
Loan Sales	1,190,004	1,052,073	3,270,723	3,621,276
Fannie Mae | Agency Business
Segment Information
Origination Volumes	995,662	650,374	2,264,870	2,216,820
Loan Sales Data:
Loan Sales	867,601	665,960	2,175,846	2,569,821
Freddie Mac | Agency Business
Segment Information
Origination Volumes	317,516	328,075	1,060,456	880,597
Loan Sales Data:
Loan Sales	286,423	342,630	974,551	862,376
FHA | Agency Business
Segment Information
Origination Volumes	77,236	18,273	137,973	189,087
Loan Sales Data:
Loan Sales	15,330	$ 43,483	83,443	167,709
CMBS/Conduit | Agency Business
Segment Information
Origination Volumes	20,650		36,883	21,370
Loan Sales Data:
Loan Sales	$ 20,650		$ 36,883	$ 21,370

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Amount of loans originated during the period.

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Amount of loans originated through loan payoffs and paydowns.

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Amount of new loans originated during the period

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Originated mortgage servicing rights rate, MSR income as a percent of loan commitments.

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Sale margin as a percent of loan sales.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3461-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

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