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LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) point | Dec. 31, 2020 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 5,602,342 | $ 3,482,865
Minimum |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 1 | $ 1
Interest rate | 0.50% | 0.50%
FICO score at loan origination | point | 604 | 505
Loan-to-value ratio at loan origination | 8.00% | 8.00%
Maximum |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 4,382 | $ 3,448
Interest rate | 9.24% | 9.24%
FICO score at loan origination | point | 829 | 829
Loan-to-value ratio at loan origination | 103.00% | 104.00%
Weighted Average |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 517 | $ 473
Interest rate | 4.25% | 4.89%
FICO score at loan origination | point | 761 | 755
Loan-to-value ratio at loan origination | 66.00% | 67.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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