FAIR VALUE - Financial Statement Items on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Loans held for sale, at fair value	$ 4,656,338	$ 8,136,817
Derivative assets, at fair value	153,607	194,665
Servicing rights, at fair value	2,213,700	2,006,712
Trading securities, at fair value	105,308	72,874
Liabilities
Derivative liabilities, at fair value	72,758	37,797
Fair Value, Recurring
Assets
Loans held for sale, at fair value	4,656,338	8,136,817
Servicing rights, at fair value	2,213,700	2,006,712
Trading securities, at fair value	105,308	72,874
Liabilities
Servicing rights, at fair value	9,107	7,310
Fair Value, Recurring \| Level 1
Assets
Loans held for sale, at fair value	0	0
Servicing rights, at fair value	0	0
Trading securities, at fair value	0	0
Liabilities
Servicing rights, at fair value	0	0
Fair Value, Recurring \| Level 2
Assets
Loans held for sale, at fair value	4,656,338	8,136,817
Servicing rights, at fair value	0	0
Trading securities, at fair value	105,308	72,874
Liabilities
Servicing rights, at fair value	0	0
Fair Value, Recurring \| Level 3
Assets
Loans held for sale, at fair value	0	0
Servicing rights, at fair value	2,213,700	2,006,712
Trading securities, at fair value	0	0
Liabilities
Servicing rights, at fair value	9,107	7,310
Fair Value, Recurring \| Carrying Amount
Assets
Cash and cash equivalents	954,930	419,571
Restricted cash	194,645	201,025
Loans held for sale, at fair value	4,656,338	8,136,817
Derivative assets, at fair value	153,607	194,665
Servicing rights, at fair value	2,213,700	2,006,712
Trading securities, at fair value	105,308	72,874
Loans eligible for repurchase	506,454	363,373
Liabilities
Warehouse and other lines of credit	4,265,343	7,457,199
Derivative liabilities, at fair value	72,758	37,797
Servicing rights, at fair value	9,107	7,310
Liability for loans eligible for repurchase	506,454	363,373
Fair Value, Recurring \| Carrying Amount \| Secured credit facilities
Liabilities
Debt obligations:	1,237,269	343,759
Fair Value, Recurring \| Carrying Amount \| Term Notes
Liabilities
Debt obligations:	199,415	199,133
Fair Value, Recurring \| Carrying Amount \| Senior Notes
Liabilities
Debt obligations:	990,456	1,085,316
Fair Value, Recurring \| Estimated Fair Value \| Level 1
Assets
Cash and cash equivalents	954,930	419,571
Restricted cash	194,645	201,025
Loans held for sale, at fair value	0	0
Derivative assets, at fair value	0	4,924
Servicing rights, at fair value	0	0
Trading securities, at fair value	0	0
Loans eligible for repurchase	0	0
Liabilities
Warehouse and other lines of credit	0	0
Derivative liabilities, at fair value	14,859	31,070
Servicing rights, at fair value	0	0
Liability for loans eligible for repurchase	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Secured credit facilities
Liabilities
Debt obligations:	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Term Notes
Liabilities
Debt obligations:	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 1 \| Senior Notes
Liabilities
Debt obligations:	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 2
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Loans held for sale, at fair value	4,656,338	8,136,817
Derivative assets, at fair value	61,721	5,358
Servicing rights, at fair value	0	0
Trading securities, at fair value	105,308	72,874
Loans eligible for repurchase	506,454	363,373
Liabilities
Warehouse and other lines of credit	4,265,343	7,457,199
Derivative liabilities, at fair value	23,618	2,964
Servicing rights, at fair value	0	0
Liability for loans eligible for repurchase	506,454	363,373
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Secured credit facilities
Liabilities
Debt obligations:	1,239,841	345,596
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Term Notes
Liabilities
Debt obligations:	200,000	200,000
Fair Value, Recurring \| Estimated Fair Value \| Level 2 \| Senior Notes
Liabilities
Debt obligations:	657,453	1,057,977
Fair Value, Recurring \| Estimated Fair Value \| Level 3
Assets
Cash and cash equivalents	0	0
Restricted cash	0	0
Loans held for sale, at fair value	0	0
Derivative assets, at fair value	91,886	184,383
Servicing rights, at fair value	2,213,700	2,006,712
Trading securities, at fair value	0	0
Loans eligible for repurchase	0	0
Liabilities
Warehouse and other lines of credit	0	0
Derivative liabilities, at fair value	34,281	3,763
Servicing rights, at fair value	9,107	7,310
Liability for loans eligible for repurchase	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Secured credit facilities
Liabilities
Debt obligations:	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Term Notes
Liabilities
Debt obligations:	0	0
Fair Value, Recurring \| Estimated Fair Value \| Level 3 \| Senior Notes
Liabilities
Debt obligations:	$ 0	$ 0

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Fair value of a liability representing servicing arrangements under which the estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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