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Residential Whole Loans - Additional Credit Related Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | $ 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 56,739 |  |  |  |  |  |  |  | 56,739 |
2020 | 202,042 |  |  |  |  |  |  |  | 202,042 |
2019 | 526,503 |  |  |  |  |  |  |  | 526,503 |
Prior | 764,950 |  |  |  |  |  |  |  | 764,950 |
Total | 1,550,234 |  |  |  |  |  |  |  | 1,550,234 |
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 14 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 278 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 3,779 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 2,283 |
Gross write-offs | 269 | $ 1,226 | $ 2,292 | $ 2,567 | $ 302 | $ 282 | $ 360 | $ 523 | $ 6,354 |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 80.00% |
Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 55,348 |  |  |  |  |  |  |  | 55,348 |
2020 | 191,326 |  |  |  |  |  |  |  | 191,326 |
2019 | 508,020 |  |  |  |  |  |  |  | 508,020 |
Prior | 696,486 |  |  |  |  |  |  |  | 696,486 |
Total | 1,451,180 |  |  |  |  |  |  |  | 1,451,180 |
Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 1,391 |  |  |  |  |  |  |  | 1,391 |
2020 | 10,716 |  |  |  |  |  |  |  | 10,716 |
2019 | 18,483 |  |  |  |  |  |  |  | 18,483 |
Prior | 68,464 |  |  |  |  |  |  |  | 68,464 |
Total | 99,054 |  |  |  |  |  |  |  | 99,054 |
Non-QM loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 45,001 |  |  |  |  |  |  |  | 45,001 |
2020 | 177,788 |  |  |  |  |  |  |  | 177,788 |
2019 | 399,854 |  |  |  |  |  |  |  | 399,854 |
Prior | 221,240 |  |  |  |  |  |  |  | 221,240 |
Total | 843,883 |  |  |  |  |  |  |  | 843,883 |
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 71 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 25 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 110 |
Gross write-offs |  |  |  |  |  |  |  |  | $ 206 |
Non-QM loans | Settled Whole Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 65.00% | 65.00%
Non-QM loans | Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 43,610 |  |  |  |  |  |  |  | 43,610 |
2020 | 167,368 |  |  |  |  |  |  |  | 167,368 |
2019 | 395,894 |  |  |  |  |  |  |  | 395,894 |
Prior | 217,863 |  |  |  |  |  |  |  | 217,863 |
Total | 824,735 |  |  |  |  |  |  |  | 824,735 |
Non-QM loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 1,391 |  |  |  |  |  |  |  | 1,391 |
2020 | 10,420 |  |  |  |  |  |  |  | 10,420 |
2019 | 3,960 |  |  |  |  |  |  |  | 3,960 |
Prior | 3,377 |  |  |  |  |  |  |  | 3,377 |
Total | 19,148 |  |  |  |  |  |  |  | 19,148 |
Transitional loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 504 |  |  |  |  |  |  |  | 504 |
2020 | 3,915 |  |  |  |  |  |  |  | 3,915 |
2019 | 23,266 |  |  |  |  |  |  |  | 23,266 |
Prior | 7,782 |  |  |  |  |  |  |  | 7,782 |
Total | 35,467 |  |  |  |  |  |  |  | 35,467 |
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 14 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 47 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 3,130 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 1,639 |
Gross write-offs |  |  |  |  |  |  |  |  | $ 4,830 |
Transitional loans | Settled Whole Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 64.00% | 66.00%
Transitional loans | Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 504 |  |  |  |  |  |  |  | 504 |
2020 | 3,915 |  |  |  |  |  |  |  | 3,915 |
2019 | 21,086 |  |  |  |  |  |  |  | 21,086 |
Prior | 7,782 |  |  |  |  |  |  |  | 7,782 |
Total | 33,287 |  |  |  |  |  |  |  | 33,287 |
Transitional loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 2,180 |  |  |  |  |  |  |  | 2,180 |
Prior | 0 |  |  |  |  |  |  |  | 0 |
Total | 2,180 |  |  |  |  |  |  |  | 2,180 |
Single-family rental loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 11,234 |  |  |  |  |  |  |  | 11,234 |
2020 | 20,339 |  |  |  |  |  |  |  | 20,339 |
2019 | 103,383 |  |  |  |  |  |  |  | 103,383 |
Prior | 37,257 |  |  |  |  |  |  |  | 37,257 |
Total | 172,213 |  |  |  |  |  |  |  | 172,213 |
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 160 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 624 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  |  |  | $ 784 |
Single-family rental loans | Settled Whole Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 70.00% | 69.00%
Single-family rental loans | Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 11,234 |  |  |  |  |  |  |  | 11,234 |
2020 | 20,043 |  |  |  |  |  |  |  | 20,043 |
2019 | 91,040 |  |  |  |  |  |  |  | 91,040 |
Prior | 36,530 |  |  |  |  |  |  |  | 36,530 |
Total | 158,847 |  |  |  |  |  |  |  | 158,847 |
Single-family rental loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 296 |  |  |  |  |  |  |  | 296 |
2019 | 12,343 |  |  |  |  |  |  |  | 12,343 |
Prior | 727 |  |  |  |  |  |  |  | 727 |
Total | 13,366 |  |  |  |  |  |  |  | 13,366 |
Seasoned performing loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 68,945 |  |  |  |  |  |  |  | 68,945 |
Total | 68,945 |  |  |  |  |  |  |  | 68,945 |
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  |  |  | $ 0 |
Seasoned performing loans | Settled Whole Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 28.00% | 30.00%
Seasoned performing loans | Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | $ 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 66,563 |  |  |  |  |  |  |  | 66,563 |
Total | 66,563 |  |  |  |  |  |  |  | 66,563 |
Seasoned performing loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 2,382 |  |  |  |  |  |  |  | 2,382 |
Total | 2,382 |  |  |  |  |  |  |  | 2,382 |
Purchased credit deteriorated loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 429,726 |  |  |  |  |  |  |  | 429,726 |
Total | 429,726 |  |  |  | 470,294 |  |  |  | 429,726 | $ 470,294
Gross write-offs, 2023 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2022 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, 2019 |  |  |  |  |  |  |  |  | 0 |
Gross write-offs, Prior |  |  |  |  |  |  |  |  | 534 |
Gross write-offs |  |  |  |  |  |  |  |  | 534 |
Purchased credit deteriorated loans | Debt-to-Value Ratio, Less Than or Equal 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 367,748 |  |  |  |  |  |  |  | 367,748 |
Total | 367,748 |  |  |  |  |  |  |  | 367,748 |
Purchased credit deteriorated loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
2023 | 0 |  |  |  |  |  |  |  | 0 |
2022 | 0 |  |  |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  |  |  | 0 |
2019 | 0 |  |  |  |  |  |  |  | 0 |
Prior | 61,978 |  |  |  |  |  |  |  | 61,978 |
Total | 61,978 |  |  |  |  |  |  |  | 61,978 |
Certain transition loans | Residential Transition Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
Purchased performing loans | $ 551,300 |  |  |  | $ 223,200 |  |  |  | $ 551,300 | $ 223,200
Certain transition loans | Settled Whole Loans |  |  |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |  |  |
LTV ratio (as a percent) |  |  |  |  |  |  |  |  | 68.00% | 70.00%

X
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