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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value and Carrying Value of Loans Held for Sale (Details) - Level 3 - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | $ 708,086 | $ 462,665
Loans held for investment | 79,482 | 0
Total | 787,568 | 462,665
Fair Value (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 824,640 | 467,805
Loans held for investment | 83,760 | 0
Total | $ 908,400 | $ 467,805

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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