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Segment Information - Origination Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Information
Origination Volumes	$ 4,829,721	$ 5,104,072	$ 4,344,328
Loan Sales Data:
Sales margin (fee-based services as a % of loan sales)	1.49%	1.42%	1.51%
MSR rate (MSR income as a % of loan commitments)	1.88%	1.94%	1.77%
Structured Business
Segment Information
New loan originations	$ 2,803,251	$ 1,656,020	$ 1,842,974
Loan payoffs / paydowns	1,748,387	955,575	924,120
Agency Business
Segment Information
Origination Volumes	4,810,225	5,124,489	4,462,436
Loan Sales Data:
Loan Sales	4,401,112	4,924,144	4,814,906
Fannie Mae | Agency Business
Segment Information
Origination Volumes	3,346,272	3,332,100	2,929,481
Loan Sales Data:
Loan Sales	3,296,523	3,217,006	3,223,953
Freddie Mac | Agency Business
Segment Information
Origination Volumes	728,317	1,587,958	1,322,498
Loan Sales Data:
Loan Sales	786,993	1,540,483	1,399,029
FHA | Agency Business
Segment Information
Origination Volumes	123,095	153,523	189,087
Loan Sales Data:
Loan Sales	106,271	115,747	170,554
CMBS/Conduit | Agency Business
Segment Information
Origination Volumes	211,325	50,908	21,370
Loan Sales Data:
Loan Sales	211,325	$ 50,908	$ 21,370
Private Label | Agency Business
Segment Information
Origination Volumes	$ 401,216

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- Definition

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=118932676&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=118932676&loc=d3e3536-108585

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