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Residential Whole Loans - Additional Credit Related Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 $ 0           $ 0  
2022 0           0  
2021 59,041           59,041  
2020 208,981           208,981  
2019 545,088           545,088  
Prior 793,094           793,094  
Total 1,606,204           1,606,204  
Gross write-offs, 2023             0  
Gross write-offs, 2022             0  
Gross write-offs, 2021             14  
Gross write-offs, 2020             189  
Gross write-offs, 2019             3,609  
Gross write-offs, prior             2,273  
Gross write-offs 1,226 $ 2,292 $ 2,567 $ 282 $ 360 $ 523 $ 6,085  
Ratio loan- to-value (as a percent)             80.00%  
Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           $ 0  
2022 0           0  
2021 57,645           57,645  
2020 197,511           197,511  
2019 536,827           536,827  
Prior 720,221           720,221  
Total 1,512,204           1,512,204  
Debt-to-Value Ratio, Greater Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           0  
2022 0           0  
2021 1,396           1,396  
2020 11,470           11,470  
2019 8,261           8,261  
Prior 72,873           72,873  
Total 94,000           94,000  
Non-QM loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           0  
2022 0           0  
2021 46,281           46,281  
2020 183,766           183,766  
2019 412,022           412,022  
Prior 231,722           231,722  
Total 873,791           873,791  
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]                
Ratio loan- to-value (as a percent)             65.00% 65.00%
Non-QM loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           $ 0  
2022 0           0  
2021 44,885           44,885  
2020 172,296           172,296  
2019 407,541           407,541  
Prior 226,678           226,678  
Total 851,400           851,400  
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 1,396           1,396  
2020 11,470           11,470  
2019 4,481           4,481  
Prior 5,044           5,044  
Total 22,391           22,391  
Transitional loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           0  
2022 0           0  
2021 504           504  
2020 3,915           3,915  
2019 25,745           25,745  
Prior 7,782           7,782  
Total 37,946           37,946  
Gross write-offs, 2023             0  
Gross write-offs, 2022             0  
Gross write-offs, 2021             14  
Gross write-offs, 2020             47  
Gross write-offs, 2019             2,970  
Gross write-offs, prior             1,639  
Gross write-offs             $ 4,670  
Transitional loans | Settled Whole Loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Ratio loan- to-value (as a percent)             64.00% 66.00%
Transitional loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           $ 0  
2022 0           0  
2021 504           504  
2020 3,915           3,915  
2019 23,565           23,565  
Prior 7,782           7,782  
Total 35,766           35,766  
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 12,256           12,256  
2020 21,300           21,300  
2019 107,321           107,321  
Prior 42,002           42,002  
Total 182,879           182,879  
Gross write-offs, 2023             0  
Gross write-offs, 2022             0  
Gross write-offs, 2021             0  
Gross write-offs, 2020             71  
Gross write-offs, 2019             614  
Gross write-offs, prior             0  
Gross write-offs             $ 685  
Single-family rental loans | Settled Whole Loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Ratio loan- to-value (as a percent)             68.00% 69.00%
Single-family rental loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2023 0           $ 0  
2022 0           0  
2021 12,256           12,256  
2020 21,300           21,300  
2019 105,721           105,721  
Prior 41,917           41,917  
Total 181,194           181,194  
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 0           0  
2019 1,600           1,600  
Prior 85           85  
Total 1,685           1,685  
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 72,675           72,675  
Total 72,675           72,675  
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]                
Ratio loan- to-value (as a percent)             28.00% 30.00%
Seasoned performing loans | Debt-to-Value Ratio, Less 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 70,272           70,272  
Total 70,272           70,272  
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 2,403           2,403  
Total 2,403           2,403  
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 438,913           438,913  
Total 438,913           438,913 $ 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             524  
Gross write-offs             524  
Purchased credit deteriorated loans | Debt-to-Value Ratio, Less 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 373,572           373,572  
Total 373,572           373,572  
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 65,341           65,341  
Total 65,341           65,341  
Certain rehabilitation loans | Transitional loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Purchased performing loans $ 423,600           $ 423,600 $ 223,200
Certain rehabilitation loans | Settled Whole Loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Ratio loan- to-value (as a percent)             69.00% 70.00%