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LOANS - Investment Loan Activity (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | $ 4,462,350 | [1]
Purchases / originations | 2,447,803 |
Sales and transfers | (2,891,854) |
Principal payments | (809,045) |
Gains / (losses) | (101,248) |
(Amortization) / accretion | 9,067 |
Ending balance | 3,083,821 | [1]
Transfer of residential loans to securitization vehicles, carrying value, noncash | 1,900,000 |
Cumulative Effect, Period of Adoption, Adjustment |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | (33,252) |
Ending balance |  |
Residential |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 1,647,787 |
Purchases / originations | 1,168,830 |
Sales and transfers | (2,298,391) |
Principal payments | (154,864) |
Gains / (losses) | (11,854) |
(Amortization) / accretion | (5,698) |
Ending balance | 345,810 |
Residential | Cumulative Effect, Period of Adoption, Adjustment |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 0 |
Ending balance |  |
Commercial |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 669,713 |
Purchases / originations | 217,329 |
Sales and transfers | (235,533) |
Principal payments | (77,422) |
Gains / (losses) | (74,965) |
(Amortization) / accretion | 2,558 |
Ending balance | 498,081 |
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | (3,599) |
Ending balance |  |
Corporate |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | 2,144,850 |
Purchases / originations | 1,061,644 |
Sales and transfers | (357,930) |
Principal payments | (576,759) |
Gains / (losses) | (14,429) |
(Amortization) / accretion | 12,207 |
Ending balance | 2,239,930 |
Corporate | Cumulative Effect, Period of Adoption, Adjustment |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |
Beginning balance | $ (29,653) |
Ending balance |  |
[1] | Includes $47.0 million and $66.7 million of residential mortgage loans held for sale.

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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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