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Residential Whole Loans (Additional Credit Related Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | $ 353,190 |  |
2019 | 2,436,830 |  |
2018 | 1,133,547 |  |
2017 | 126,445 |  |
2016 | 16,273 |  |
Prior | 902,298 |  |
Residential whole loans, at carrying value, total or weighted average | 4,968,583 |  |
Gross write-offs, 2018 | 334 |  |
Gross write-offs, prior | 313 |  |
Net write-offs, 2018 | 334 |  |
Net write-offs, 2018 | 313 |  |
Three Months Ended March 31, 2020 Gross write-offs | 647 | $ 512 |
Three Months Ended March 31, 2020 Net write-offs | 647 |  |
Purchased Performing Loans | $ 5,189,634 |  | $ 5,370,653
Ratio Loan-To-Value | 80.00% |  |
Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | $ 322,615 |  |
2019 | 2,372,063 |  |
2018 | 1,099,660 |  |
2017 | 115,251 |  |
2016 | 12,350 |  |
Prior | 587,392 |  |
Residential whole loans, at carrying value, total or weighted average | 4,509,331 |  |
Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 30,575 |  |
2019 | 64,767 |  |
2018 | 33,887 |  |
2017 | 11,194 |  |
2016 | 3,923 |  |
Prior | 314,906 |  |
Residential whole loans, at carrying value, total or weighted average | 459,252 |  |
Non-QM Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 275,473 |  |
2019 | 1,364,836 |  |
2018 | 821,944 |  |
2017 | 101,808 |  |
2016 | 9,205 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 2,573,266 |  |
Loan held for sale, amortized cost | 965,500 |  |
Purchased Performing Loans | 3,538,725 |  | 3,707,245
Non-QM Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 252,458 |  |
2019 | 1,331,053 |  |
2018 | 790,056 |  |
2017 | 92,314 |  |
2016 | 9,055 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 2,474,936 |  |
Non-QM Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 23,015 |  |
2019 | 33,783 |  |
2018 | 31,888 |  |
2017 | 9,494 |  |
2016 | 150 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 98,330 |  |
Rehabilitation loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 53,518 |  |
2019 | 753,382 |  |
2018 | 162,122 |  |
2017 | 9,943 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 978,965 |  |
Gross write-offs, 2018 | 334 |  |
Gross write-offs, prior | 94 |  |
Net write-offs, 2018 | 334 |  |
Net write-offs, 2018 | 94 |  |
Three Months Ended March 31, 2020 Gross write-offs | 428 |  |
Three Months Ended March 31, 2020 Net write-offs | 428 |  |
Purchased Performing Loans | 978,965 |  | 1,026,097
Rehabilitation loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 48,534 |  |
2019 | 735,912 |  |
2018 | 160,334 |  |
2017 | 8,243 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 953,023 |  |
Rehabilitation loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 4,984 |  |
2019 | 17,470 |  |
2018 | 1,788 |  |
2017 | 1,700 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 25,942 |  |
Single-family rental loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 24,199 |  |
2019 | 318,612 |  |
2018 | 149,481 |  |
2017 | 14,060 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 506,352 |  |
Purchased Performing Loans | 506,352 |  | 460,742
Single-family rental loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 21,623 |  |
2019 | 305,098 |  |
2018 | 149,270 |  |
2017 | 14,060 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 490,051 |  |
Single-family rental loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 2,576 |  |
2019 | 13,514 |  |
2018 | 211 |  |
2017 | 0 |  |
2016 | 0 |  |
Prior | 0 |  |
Residential whole loans, at carrying value, total or weighted average | 16,301 |  |
Seasoned performing loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 0 |  |
2016 | 81 |  |
Prior | 165,511 |  |
Residential whole loans, at carrying value, total or weighted average | 165,592 |  |
Purchased Performing Loans | 165,592 |  | 176,569
Seasoned performing loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 0 |  |
2016 | 81 |  |
Prior | 156,733 |  |
Residential whole loans, at carrying value, total or weighted average | 156,814 |  |
Seasoned performing loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 0 |  |
2016 | 0 |  |
Prior | 8,778 |  |
Residential whole loans, at carrying value, total or weighted average | 8,778 |  |
Purchased Credit Deteriorated Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 634 |  |
2016 | 6,987 |  |
Prior | 736,787 |  |
Residential whole loans, at carrying value, total or weighted average | 744,408 |  |
Gross write-offs, prior | 219 |  |
Net write-offs, 2018 | 219 |  |
Three Months Ended March 31, 2020 Gross write-offs | 219 |  |
Three Months Ended March 31, 2020 Net write-offs | 219 |  |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, Less than 80 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 634 |  |
2016 | 3,214 |  |
Prior | 430,659 |  |
Residential whole loans, at carrying value, total or weighted average | 434,507 |  |
Purchased Credit Deteriorated Loans | Debt-to-Value Ratio, 80 to 100 Percent |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 0 |  |
2017 | 0 |  |
2016 | 3,773 |  |
Prior | 306,128 |  |
Residential whole loans, at carrying value, total or weighted average | 309,901 |  |
Settled Whole Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Residential whole loans, at carrying value, total or weighted average | 5,716,031 |  | 6,066,345
Settled Whole Loans | Non-QM Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Purchased Performing Loans | $ 3,434,894 |  | $ 3,706,857
Ratio Loan-To-Value | 66.00% |  | 67.00%
Settled Whole Loans | Rehabilitation loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Purchased Performing Loans | $ 943,332 |  | $ 1,023,766
Ratio Loan-To-Value | 64.00% |  | 64.00%
Settled Whole Loans | Single-family rental loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Purchased Performing Loans | $ 498,921 |  | $ 460,679
Ratio Loan-To-Value | 70.00% |  | 70.00%
Settled Whole Loans | Seasoned performing loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Purchased Performing Loans | $ 165,343 |  | $ 176,569
Ratio Loan-To-Value | 42.00% |  | 46.00%
Settled Whole Loans | Certain Rehabilitation Loans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Purchased Performing Loans | $ 259,400 |  | $ 269,200
Ratio Loan-To-Value | 68.00% |  | 69.00%

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