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Residential Whole Loans - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance $ 31,035 $ 33,062 $ 35,314 $ 36,927 $ 35,457 $ 39,447 $ 35,314
Current provision/(reversal) (1,252) 265 315 547 1,830 (3,467)  
Write-offs (1,226) (2,292) (2,567) (282) (360) (523) (6,085)
Ending balance 28,557 31,035 33,062 37,192 36,927 35,457 28,557
Fair Value / Carrying Value 28,557 31,035 33,062 37,192 36,927 35,457 28,557
Loans 1,606,204           1,606,204
Non-QM loans              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance 6,706 7,145 7,359 7,130 7,329 8,289 7,359
Current provision/(reversal) (2,627) (233) (214) (242) (199) (909)  
Write-offs 0 (206) 0 0 0 (51)  
Ending balance 4,079 6,706 7,145 6,888 7,130 7,329 4,079
Fair Value / Carrying Value 4,079 6,706 7,145 6,888 7,130 7,329 4,079
Transitional loans              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance 2,840 3,626 5,223 5,061 5,202 6,881 5,223
Current provision/(reversal) 559 999 406 583 (23) (1,460)  
Write-offs (881) (1,785) (2,003) (114) (118) (219)  
Ending balance 2,518 2,840 3,626 5,530 5,061 5,202 2,518
Fair Value / Carrying Value 2,518 2,840 3,626 5,530 5,061 5,202 2,518
Loans 28,700     66,700     28,700
Single-family rental loans              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance 1,237 1,340 1,277 1,292 1,302 1,451 1,277
Current provision/(reversal) 329 (103) 514 83 174 (122)  
Write-offs (235) 0 (451) (61) (184) (27)  
Ending balance 1,331 1,237 1,340 1,314 1,292 1,302 1,331
Fair Value / Carrying Value 1,331 1,237 1,340 1,314 1,292 1,302 1,331
Seasoned performing loans              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance 42 46 48 46 45 46 48
Current provision/(reversal) (14) (4) (2) 3 1 (1)  
Write-offs 0 0 0 0 0 0  
Ending balance 28 42 46 49 46 45 28
Fair Value / Carrying Value 28 42 46 49 46 45 28
Purchased Credit Deteriorated Loans              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Beginning balance 20,210 20,905 21,407 23,398 21,579 22,780 21,407
Current provision/(reversal) 501 (394) (389) 120 1,877 (975)  
Write-offs (110) (301) (113) (107) (58) (226)  
Ending balance 20,601 20,210 20,905 23,411 23,398 21,579 20,601
Fair Value / Carrying Value 20,601 $ 20,210 $ 20,905 23,411 $ 23,398 $ 21,579 20,601
Loans 52,600     56,200     52,600
Unfunded Loan Commitment              
Financing Receivable, Allowance for Credit Loss [Roll Forward]              
Ending balance 38     84     38
Commitment to lend, unfunded 5,400     8,400     5,400
Fair Value / Carrying Value $ 38     $ 84     $ 38