The aggregate amount of the participating mortgage obligation at the end of the accounting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377297&loc=d3e10013-112621

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- Definition

The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

Mortgage servicing rights of fair value.

+ References

No definition available.

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- Definition

Servicing Asset At Fair Value, Reserves And Transaction Costs On Disposal

+ References

No definition available.

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Mortgage Servicing Rights - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Aggregate unpaid principal balance	$ 2,900,310	$ 2,900,310		$ 1,756,864
Proceeds from sale of mortgage servicing rights		241,634	$ 217,786
Reserves and transaction costs on sales of servicing rights	(14,895)	(14,895)
MSR
Aggregate unpaid principal balance	22,700,000	$ 22,700,000
Proceeds from sale of mortgage servicing rights	269,900
Reserves and transaction costs on sales of servicing rights	$ 14,900
UNITED WHOLESALE MORTGAGE, LLC
Mortgage obligations amount				188,300,000	$ 72,600,000
Mortgage Servicing Rights Of fair value				1,760,000	744,000
Aggregate unpaid principal balance				1,756,864	731,353
Proceeds from sale of mortgage servicing rights				$ 289,170	$ 594,150