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Residential Whole Loans - Additional Credit Related Information (Details) - Residential whole loan - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Gross write-offs | $ 672 | $ 5,262 | $ 379 | $ 1,226 | $ 2,292 | $ 2,567 |  |
Business purpose loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Total | 3,684,042 |  |  |  |  |  | $ 3,684,042 | $ 3,996,292
Non-QM loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Total | 4,172,797 |  |  |  |  |  | 4,172,797 | 3,805,577
Gross write-offs | 0 | 0 | 0 | 0 | 206 | 0 |  |
Legacy RPL/NPL loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
Total | 1,125,280 |  |  |  |  |  | 1,125,280 | 1,204,095
Gross write-offs | 52 | $ 170 | $ 22 | $ 110 | $ 301 | $ 113 |  |
Carrying Value |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 48,548 |  |  |  |  |  | 48,548 |
2020 | 184,024 |  |  |  |  |  | 184,024 |
Prior | 1,130,715 |  |  |  |  |  | 1,130,715 |
Total | 1,363,287 |  |  |  |  |  | 1,363,287 |
Gross write-offs, 2022 |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  | 12 |
Gross write-offs, 2020 |  |  |  |  |  |  | 367 |
Gross write-offs, prior |  |  |  |  |  |  | 5,935 |
Gross write-offs |  |  |  |  |  |  | 6,314 |
Carrying Value | Debt-to-Value Ratio, Less Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 46,624 |  |  |  |  |  | 46,624 |
2020 | 175,009 |  |  |  |  |  | 175,009 |
Prior | 1,067,670 |  |  |  |  |  | 1,067,670 |
Total | 1,289,303 |  |  |  |  |  | 1,289,303 |
Carrying Value | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 1,924 |  |  |  |  |  | 1,924 |
2020 | 9,015 |  |  |  |  |  | 9,015 |
Prior | 63,045 |  |  |  |  |  | 63,045 |
Total | 73,984 |  |  |  |  |  | 73,984 |
Carrying Value | Business purpose loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 7,139 |  |  |  |  |  | 7,139 |
2020 | 19,109 |  |  |  |  |  | 19,109 |
Prior | 118,287 |  |  |  |  |  | 118,287 |
Total | 144,535 |  |  |  |  |  | 144,535 | 207,680
Gross write-offs, 2022 |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  | 12 |
Gross write-offs, 2020 |  |  |  |  |  |  | 367 |
Gross write-offs, prior |  |  |  |  |  |  | 5,690 |
Gross write-offs |  |  |  |  |  |  | 6,069 |
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Less Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 7,139 |  |  |  |  |  | 7,139 |
2020 | 17,139 |  |  |  |  |  | 17,139 |
Prior | 113,636 |  |  |  |  |  | 113,636 |
Total | 137,914 |  |  |  |  |  | 137,914 |
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  | 0 |
2020 | 1,970 |  |  |  |  |  | 1,970 |
Prior | 4,651 |  |  |  |  |  | 4,651 |
Total | 6,621 |  |  |  |  |  | 6,621 |
Carrying Value | Non-QM loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 41,409 |  |  |  |  |  | 41,409 |
2020 | 164,915 |  |  |  |  |  | 164,915 |
Prior | 545,226 |  |  |  |  |  | 545,226 |
Total | 751,550 |  |  |  |  |  | 751,550 | 843,884
Gross write-offs, 2022 |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  | 0 |
Gross write-offs, prior |  |  |  |  |  |  | 0 |
Gross write-offs |  |  |  |  |  |  | 0 |
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Less Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 39,485 |  |  |  |  |  | 39,485 |
2020 | 157,870 |  |  |  |  |  | 157,870 |
Prior | 540,769 |  |  |  |  |  | 540,769 |
Total | 738,124 |  |  |  |  |  | 738,124 |
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 1,924 |  |  |  |  |  | 1,924 |
2020 | 7,045 |  |  |  |  |  | 7,045 |
Prior | 4,457 |  |  |  |  |  | 4,457 |
Total | 13,426 |  |  |  |  |  | 13,426 |
Carrying Value | Legacy RPL/NPL loans |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  | 0 |
Prior | 467,202 |  |  |  |  |  | 467,202 |
Total | 467,202 |  |  |  |  |  | 467,202 | $ 498,671
Gross write-offs, 2022 |  |  |  |  |  |  | 0 |
Gross write-offs, 2021 |  |  |  |  |  |  | 0 |
Gross write-offs, 2020 |  |  |  |  |  |  | 0 |
Gross write-offs, prior |  |  |  |  |  |  | 245 |
Gross write-offs |  |  |  |  |  |  | 245 |
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Less Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  | 0 |
Prior | 413,265 |  |  |  |  |  | 413,265 |
Total | 413,265 |  |  |  |  |  | 413,265 |
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Greater Than 80 Percent |  |  |  |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |  |  |  |
2022 | 0 |  |  |  |  |  | 0 |
2021 | 0 |  |  |  |  |  | 0 |
2020 | 0 |  |  |  |  |  | 0 |
Prior | 53,937 |  |  |  |  |  | 53,937 |
Total | $ 53,937 |  |  |  |  |  | $ 53,937 |

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