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LOANS - Additional Information about Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) point | Dec. 31, 2018 USD ($) point | Dec. 31, 2017 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unpaid principal balance | $ 4,133,149 | $ 2,425,657 |
Minimum |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unpaid principal balance |  | $ 1 | $ 0
Interest rate |  | 2.00% | 2.00%
FICO score at loan origination | point |  | 505 | 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 |  | $ 3,448 | $ 3,500
Interest rate |  | 8.38% | 7.75%
FICO score at loan origination | point |  | 829 | 823
Loan-to-value ratio at loan origination |  | 105.00% | 111.00%
Weighted Average |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unpaid principal balance | $ 459 | $ 457 |
Interest rate | 4.94% | 4.72% |
FICO score at loan origination | point | 758 | 752 |
Loan-to-value ratio at loan origination | 67.00% | 68.00% |

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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=109247956&loc=d3e107314-111719 + Details
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