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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) loan | Sep. 30, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Loans and Investments |  |  |  |  |  |  |  |
Loans and investments, gross | $ 11,565,538 | $ 11,565,538 | $ 12,615,006 |  |  |  |  |
Allowance for credit losses | (243,588) | (243,588) | (195,664) | $ (238,923) |  | $ (184,069) | $ (169,054) | $ (132,559)
Unearned revenue | (29,303) | (29,303) | (41,536) |  |  |  |  |
Loans and investments, net | $ 11,292,647 | $ 11,292,647 | $ 12,377,806 |  |  |  |  |
Percent of Total | 100.00% | 100.00% | 100.00% |  |  |  |  |
Loan Count | loan |  | 789 | 747 |  |  |  |  |
Wtd. Avg. Pay Rate (as a percent) |  | 7.25% | 8.42% |  |  |  |  |
Wtd. Avg. Remaining Months to Maturity |  | 11 months 24 days | 13 months 6 days |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 2.00% | 2.00% |  |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 80.00% | 80.00% |  |  |  |  |  |
Weighted average remaining months to maturity including extension options | 24 months 3 days |  | 29 months 12 days |  |  |  |  |
Single-Family Rental |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Allowance for credit losses | $ (4,220) | $ (4,220) | $ (1,624) | $ (3,913) |  | $ (1,239) | (1,077) | $ (781)
Bridge loans |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Loans and investments, gross | $ 11,169,284 | $ 11,169,284 | $ 12,273,244 |  | $ 13,500 |  | $ 70,500 |
Percent of Total | 97.00% | 97.00% | 97.00% |  |  |  |  |
Loan Count | loan |  | 702 | 679 |  |  |  |  |
Wtd. Avg. Pay Rate (as a percent) |  | 7.26% | 8.45% |  |  |  |  |
Wtd. Avg. Remaining Months to Maturity |  | 10 months 15 days | 12 months |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00% | 0.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 80.00% | 80.00% | 78.00% |  |  |  |  |
Bridge loans | Single-Family Rental |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Number of loans under the loan portfolio | loan | 425 | 425 | 354 |  |  |  |  |
Total loan commitment |  | $ 3,750,000 | $ 2,860,000 |  |  |  |  |
Mezzanine loans |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Loans and investments, gross | $ 273,086 | $ 273,086 | $ 248,457 |  |  |  |  |
Percent of Total | 2.00% | 2.00% | 2.00% |  |  |  |  |
Loan Count | loan |  | 59 | 49 |  |  |  |  |
Wtd. Avg. Pay Rate (as a percent) |  | 7.84% | 8.41% |  |  |  |  |
Wtd. Avg. Remaining Months to Maturity |  | 50 months 24 days | 56 months 18 days |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 51.00% | 51.00% | 48.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 82.00% | 82.00% | 80.00% |  |  |  |  |
Preferred equity investments |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Loans and investments, gross | $ 120,082 | $ 120,082 | $ 85,741 |  |  |  |  |
Percent of Total | 1.00% | 1.00% | 1.00% |  |  |  |  |
Loan Count | loan |  | 27 | 17 |  |  |  |  |
Wtd. Avg. Pay Rate (as a percent) |  | 5.27% | 3.95% |  |  |  |  |
Wtd. Avg. Remaining Months to Maturity |  | 52 months 6 days | 60 months 9 days |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 56.00% | 56.00% | 53.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 80.00% | 80.00% | 82.00% |  |  |  |  |
SFR permanent loans |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Loans and investments, gross | $ 3,086 | $ 3,086 | $ 7,564 |  |  |  |  |
Percent of Total | 1.00% | 1.00% | 1.00% |  |  |  |  |
Loan Count | loan |  | 1 | 2 |  |  |  |  |
Wtd. Avg. Pay Rate (as a percent) |  | 9.88% | 9.84% |  |  |  |  |
Wtd. Avg. Remaining Months to Maturity |  | 13 months 9 days | 13 months 27 days |  |  |  |  |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00% | 0.00% |  |  |  |  |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 40.00% | 40.00% | 56.00% |  |  |  |  |
SFR permanent loans | Single-Family Rental |  |  |  |  |  |  |  |
Loans and Investments |  |  |  |  |  |  |  |
Unpaid principal balance, funded | $ 1,780,000 | $ 1,780,000 | $ 1,320,000 |  |  |  |  |

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