LOANS HELD FOR SALE, AT FAIR VALUE - Summary of Changes in Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 6,558,668	$ 8,787,756	$ 8,136,817	$ 6,955,424
Origination and purchase of loans	15,769,229	34,413,319	37,142,855	75,814,894
Sales	(17,876,229)	(34,294,254)	(40,681,596)	(74,213,668)
Repurchases	194,650	111,385	333,666	663,700
Principal payments	(40,598)	(43,206)	(100,885)	(66,506)
Fair value gain (loss)	50,618	145,653	(174,519)	(33,191)
Balance at end of period	$ 4,656,338	$ 9,120,653	$ 4,656,338	$ 9,120,653

Loans Receivable Held-For-Sale, Change In Fair Value

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- Definition

Loans Receivable Held-For-Sale, Principal Payments

+ References

No definition available.

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- Definition

Loans Receivable Held-For-Sale, Repurchases

+ References

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- Definition

Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount, after allowance for bad debt, of additions to loan receivables held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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- Definition

Amount, after allowance for bad debt, of deductions to loan receivables held-for-sale that are not part of a disposal group.

+ References

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