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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | $ 708,086 |  | $ 708,086 |  | $ 708,086 | $ 462,665
Loans held for sale forgiven | 97,600 |  | 387,900 |  | 434,200 |
Revenue | 3,844,727 | $ 3,033,874 | 13,582,669 | $ 6,338,608 |  |
Paycheck Protection Program, CARES Act Loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans held for sale | 605,400 |  | 605,400 |  | $ 605,400 |
Revenue | 13,300 |  | 37,600 |  |  |
Loans Receivable Held-For-Sale |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Excess amortized cost over fair value of loans | $ 4,400 | $ 3,200 | $ 6,000 | $ 25,700 |  |

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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 + Details
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