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Agreements and Transactions with Related Parties - 2020 Activity (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) property | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) property | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 31, 2023 property | Nov. 30, 2023 USD ($) | Apr. 30, 2023 USD ($) | Dec. 31, 2021 USD ($)
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loans and investments funded, originated and purchased |  |  | $ 912,530 | $ 1,061,865 |  |  |  |  |  |
Interest income | $ 286,522 | $ 336,474 | 905,002 | 1,000,159 |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Amount invested |  |  |  |  |  |  |  |  |  | $ 4,200
Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  | 18.90% |  |  |  |
Bridge loans | Other Related Party Transactions | Immediate Family Member of Management or Principal Owner |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  |  | 21.80% |  |  |  |
Single-Family Rental | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loan committed |  |  | 39,400 |  |  |  |  |  |  |
Loans and investments funded, originated and purchased |  |  |  |  |  | $ 3,500 |  |  |  |
Loan committed upsized |  |  |  |  |  |  |  | $ 39,900 | $ 38,900 |
Single-Family Rental | Preferred equity investments | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loans and investments funded, originated and purchased |  |  |  |  |  | $ 4,600 |  |  |  |
Single-Family Rental | Mezzanine Loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Interest income | $ 100 | 100 | $ 200 | 200 |  |  |  |  |  |
Multifamily |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property | 3 |  | 3 |  |  |  | 1 |  |  |
Maturity Date December 2023 | Other Related Party Transactions | Immediate Family Member of Management or Principal Owner | Preferred equity interest financing agreement |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Interest income | $ 1,100 |  | $ 3,200 |  |  |  |  |  |  |
Maturity Date December 2023 | Bridge loans | Other Related Party Transactions | Immediate Family Member of Management or Principal Owner |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Base spread, percentage |  |  |  |  |  | 3.75% |  |  |  |
SOFR floor, percentage |  |  |  |  |  | 0.75% |  |  |  |
Interest income |  | 800 |  | 2,000 |  |  |  |  |  |
Maturity Date December 2023 | Preferred equity investments | Other Related Party Transactions | Immediate Family Member of Management or Principal Owner |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Fixed rate of interest |  |  |  |  |  | 12.00% |  |  |  |
Maturity Date December 2023 | Single-Family Rental | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loan committed |  |  |  |  |  | $ 32,500 |  |  |  |
Maturity date of May 2025 | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loan committed |  |  | 22,500 |  |  |  |  |  |  |
Equity participation interest (as a percentage) |  |  |  |  | 2.25% |  |  |  |  |
Base spread, percentage |  |  |  |  | 4.63% |  |  |  |  |
SOFR floor, percentage |  |  |  |  | 0.25% |  |  |  |  |
Interest income | 500 |  | 900 |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 67,100 |  |  |  |  |
Maturity date of May 2025 | Single-Family Rental | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Loan committed |  |  |  |  |  | $ 30,500 |  |  |  |
Matures in May 2023 | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Base spread, percentage |  |  |  |  |  | 4.25% |  |  |  |
SOFR floor, percentage |  |  |  |  |  | 1.00% |  |  |  |
Amount invested | 35,200 |  | 35,200 |  |  |  |  |  |  |
Matures in April 2023 | Bridge loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Interest income | 1,100 | $ 1,000 | 3,300 | $ 2,500 |  |  |  |  |  |
Matures in April 2023 | Preferred equity investments | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Fixed rate of interest |  |  |  |  |  | 12.00% |  |  |  |
Maturity Date April 2030 | Bridge loan, two multifamily properties | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 14,800 |  |  |  |
Percentage of ownership interest of related party in the entity |  |  |  |  |  | 50.00% |  |  |  |
Maturity Date April 2030 | Mezzanine Loans | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Fixed rate of interest |  |  |  |  |  | 9.00% |  |  |  |
Maturity Date April 2030 | Multifamily | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  |  |  | 2 |  |  |  |
Maturity Date April 2030 | Multifamily | Preferred equity investments | Other Related Party Transactions | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  | $ 3,400 |  |  |  |
Maturity Date July 2023 | Bridge loans | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Principal amount | 35,000 |  | 35,000 |  |  |  |  |  |  |
Maturity Date June 2027 | Preferred equity investments | Related Party |  |  |  |  |  |  |  |  |  |
Agreements and Transactions with Related Parties |  |  |  |  |  |  |  |  |  |
Equity investment | $ 10,000 |  | $ 10,000 |  |  |  |  |  |  |

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