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Segment Information - Origination Data (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016
Segment Information
Origination Volumes	$ 928,180,800	$ 714,820,818		$ 3,181,367,322	$ 714,820,818
Loan Sales Data:
Loan Sales		$ 970,000,000			$ 970,000,000
Sales margin (fee-based services as a % of loan sales)	1.63%	1.76%		1.52%	1.76%
MSR rate (MSR income as a % of loan commitments)	2.04%	2.23%		1.77%	2.23%
Structured Business
Segment Information
New loan originations	$ 473,171,000	$ 266,599,500		$ 1,057,003,885	$ 654,967,500
Loan payoffs / paydowns	270,010,000	118,346,618		723,976,741	418,433,132
Agency Business
Segment Information
Origination Volumes	996,721,800	850,419,655		3,307,873,722	850,419,655
Loan Sales Data:
Loan Sales	1,052,073,409	551,834,215	[1]	3,621,276,437	551,834,215	[1]
Fannie Mae | Agency Business
Segment Information
Origination Volumes	650,373,500	668,644,832		2,216,819,525	668,644,832
Loan Sales Data:
Loan Sales	665,959,500	430,371,100		2,569,821,000	430,371,100
Freddie Mac | Agency Business
Segment Information
Origination Volumes	328,075,000	157,145,000		880,597,200	157,145,000
Loan Sales Data:
Loan Sales	342,629,800	104,448,000		862,376,636	104,448,000
FHA | Agency Business
Segment Information
Origination Volumes	18,273,300	24,629,823		189,086,997	24,629,823
Loan Sales Data:
Loan Sales	$ 43,484,109	$ 17,015,115		167,708,801	$ 17,015,115
CMBS/Conduit | Agency Business
Segment Information
Origination Volumes				21,370,000
Loan Sales Data:
Loan Sales				$ 21,370,000
[1] Loan sales were $970.0 million for the three and nine months ended September 30, 2016, including loans that were acquired as part of the Acquisition.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585

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