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Loans and Investments - Loan Sales (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Apr. 30, 2023 USD ($) loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans sold | loan |  | 4 |  |  |
Bridge loans, total UPB |  |  | $ 427,929 | $ 157,960 |
Gain on sales, including fee-based services, net |  |  | 72,522 | 55,816 | $ 123,037
Interest reserve |  |  | $ 156,100 | $ 123,700 |
Number of loans covered under interest reserve | loan |  |  | 537 | 480 |
Interest reserve, unpaid principal balance |  |  | $ 8,440,000 | $ 7,700,000 |
Bridge Loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans sold | loan |  |  |  | 4 |
Bridge loans, total UPB |  | $ 217,400 |  |  |
Unpaid principal balance on loans |  |  |  | $ 296,900 |
Gain on sales, including fee-based services, net |  |  |  | 2,000 |
Financing receivable |  |  |  | 78,000 |
Interest reserve | $ 2,500 |  |  |  |
Bridge Loan and Mezzanine Loan |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Total mortgage loans and mezzanine loan sold |  |  |  | 110,500 |
Loan discount |  |  |  | 102,200 |
Capital investment to be used for future |  |  |  | 66,300 |
Fees and expenses |  |  |  | 9,200 |
Additional potential loan recover |  |  |  | $ 2,800 |

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