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Segment Information - Origination Data (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) loan	Jun. 30, 2020 USD ($) loan
Segment Information
Origination Volumes	$ 1,194,344,000	$ 1,206,723,000	$ 2,654,479,000	$ 2,473,941,000
Loan Sales Data:
Loan Sales	$ 1,482,109,000	$ 1,992,889,000	$ 3,324,000,000	$ 2,949,949,000
Sales margin (fee-based services as a % of loan sales)	2.76%	1.32%	2.10%	1.38%
MSR rate (MSR income as a % of loan commitments)	2.20%	2.69%	2.38%	2.20%
Structured Business
Segment Information
Total new loan originations	$ 1,838,945,000	$ 300,481,000	$ 2,926,871,000	$ 1,156,710,000
Loan payoffs / paydowns	662,940,000	159,174,000	895,968,000	434,466,000
Structured Business | Bridge loans
Segment Information
Total new loan originations	1,800,688,000	298,934,000	2,806,376,000	1,084,056,000
Structured Business | Mezzanine loans
Segment Information
Total new loan originations	$ 38,257,000	1,547,000	94,257,000	15,722,000
Structured Business | Preferred equity investments
Segment Information
Total new loan originations				23,500,000
Structured Business | Other loans
Segment Information
Total new loan originations			$ 26,238,000	$ 33,432,000
Structured Business | SFR - Fixed Rate | Bridge loans
Segment Information
Number of loans committed by Entity | loan	1		4
Loans committed	$ 40,000,000.0		$ 138,400,000
Number of loans under the loan portfolio	25		43
Total loan commitment	$ 70,900,000		$ 114,200,000
Structured Business | SFR - Fixed Rate | Other loans
Segment Information
Number of loans under the loan portfolio | loan			1	7
Total loan commitment			$ 26,200,000	$ 32,300,000
Agency Business
Segment Information
Origination Volumes	1,313,352,000	1,400,556,000	2,710,986,000	2,482,528,000
Agency Business | SFR - Fixed Rate
Segment Information
Origination Volumes	11,996,000		11,996,000
Loan Sales Data:
Loan Sales	11,996,000		75,294,000
Agency Business | Fannie Mae
Segment Information
Origination Volumes	637,494,000	1,140,181,000	1,701,477,000	1,722,154,000
Loan Sales Data:
Loan Sales	722,499,000	1,063,923,000	2,159,865,000	1,817,967,000
Agency Business | Private Label
Segment Information
Origination Volumes	377,184,000	49,122,000	529,638,000	331,467,000
Loan Sales Data:
Loan Sales	449,890,000	727,154,000	449,890,000	727,154,000
Agency Business | Freddie Mac
Segment Information
Origination Volumes	155,914,000	135,720,000	270,631,000	335,431,000
Loan Sales Data:
Loan Sales	134,122,000	171,688,000	408,946,000	351,391,000
Agency Business | FHA
Segment Information
Origination Volumes	130,764,000	75,533,000	197,244,000	93,476,000
Loan Sales Data:
Loan Sales	$ 163,602,000	$ 30,124,000	$ 230,005,000	$ 53,437,000

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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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=121586364&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=121586364&loc=d3e3536-108585

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