SERVICING RIGHTS, AT FAIR VALUE - Components of Service Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Total portfolio	$ 139,709,633	$ 162,112,965
Conventional
Servicing Assets at Fair Value [Line Items]
Total portfolio	103,719,089	127,270,097
Government
Servicing Assets at Fair Value [Line Items]
Total portfolio	$ 35,990,544	$ 34,842,868

This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Name:	us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant