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LOANS - Additional Information about Residential Mortgage Loans (Details) - Residential mortgage loans $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) point | Dec. 31, 2018 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 3,475,799 | $ 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 | 9.25% | 7.75%
FICO score at loan origination | point | 825 | 823
Loan-to-value ratio at loan origination | 111.00% | 111.00%
Weighted Average |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 463 | $ 457
Interest rate | 5.03% | 4.72%
FICO score at loan origination | point | 756 | 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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