LOANS HELD FOR SALE, AT FAIR VALUE - Summary of Changes in Balances (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Balance at beginning of period	$ 8,787,756	$ 3,542,329	$ 6,955,424	$ 3,681,840
Origination and purchase of loans	34,413,319	20,975,280	75,814,894	36,081,739
Sales	(34,294,254)	(21,286,239)	(74,213,668)	(36,593,749)
Repurchases	111,386	98,261	663,700	108,282
Principal payments	(43,206)	(33,486)	(66,506)	(36,486)
Fair value gain (loss)	145,652	7,293	(33,191)	61,812
Balance at end of period	$ 9,120,653	$ 3,303,438	$ 9,120,653	$ 3,303,438

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

No definition available.

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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 http://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 http://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 http://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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