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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%