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LOANS - Investment Loan Activity (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | $ 3,083,821 | [1],[2]
Ending balance September 30, 2021 | 3,580,521 | [2]
Transfer of residential loans to securitization vehicles, carrying value, noncash | 2,000,000 |
Total |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | 3,083,821 |
Purchases / originations | 5,248,097 |
Sales and transfers | (4,160,384) |
Principal payments | (675,250) |
Gains / (losses) | 78,826 |
(Amortization) / accretion | 3,980 |
Ending balance September 30, 2021 | 3,579,090 |
Residential |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | 345,810 |
Purchases / originations | 3,597,844 |
Sales and transfers | (2,206,190) |
Principal payments | (43,690) |
Gains / (losses) | (784) |
(Amortization) / accretion | (6,722) |
Ending balance September 30, 2021 | 1,686,268 |
Commercial |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | 498,081 |
Purchases / originations | 126,722 |
Sales and transfers | (608,202) |
Principal payments | (84,929) |
Gains / (losses) | 67,784 |
(Amortization) / accretion | 544 |
Ending balance September 30, 2021 | 0 |
Corporate Debt |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | 2,239,930 |
Purchases / originations | 1,055,048 |
Sales and transfers | (879,622) |
Principal payments | (546,631) |
Gains / (losses) | 11,826 |
(Amortization) / accretion | 10,158 |
Ending balance September 30, 2021 | 1,890,709 |
Corporate Debt Held for Sale |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance January 1, 2021 | 0 |
Purchases / originations | 468,483 |
Sales and transfers | (466,370) |
Principal payments | 0 |
Gains / (losses) | 0 |
(Amortization) / accretion | 0 |
Ending balance September 30, 2021 | $ 2,113 |
[1] | (1)Derived from the audited consolidated financial statements at December 31, 2020.
[2] | (4)Includes $3.7 million and $47.0 million of residential mortgage loans held for sale at September 30, 2021 and December 31, 2020, respectively, and $2.1 million and $0 of corporate loans held for sale at September 30, 2021 and December 31, 2020, respectively.

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