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Residential Whole Loans - Allowance for Credit Losses (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
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance $ 28,557 $ 31,035 $ 33,062 $ 35,314 $ 37,192 $ 36,927 $ 35,457 $ 39,447 $ 35,314
Current provision/(reversal) (7,838) (1,252) 265 315 (1,576) 547 1,830 (3,467)  
Write-offs (269) (1,226) (2,292) (2,567) (302) (282) (360) (523) (6,354)
Ending balance 20,451 28,557 31,035 33,062 35,314 37,192 36,927 35,457 20,451
Allowance for credit loss 20,451 28,557 31,035 33,062 35,314 37,192 36,927 35,457 20,451
Loans 1,550,234               1,550,234
Non-QM loans                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance 4,079 6,706 7,145 7,359 6,888 7,130 7,329 8,289 7,359
Current provision/(reversal) (2,208) (2,627) (233) (214) 471 (242) (199) (909)  
Write-offs 0 0 (206) 0 0 0 0 (51)  
Ending balance 1,871 4,079 6,706 7,145 7,359 6,888 7,130 7,329 1,871
Allowance for credit loss 1,871 4,079 6,706 7,145 7,359 6,888 7,130 7,329 1,871
Transitional loans                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance 2,518 2,840 3,626 5,223 5,530 5,061 5,202 6,881 5,223
Current provision/(reversal) 230 559 999 406 (13) 583 (23) (1,460)  
Write-offs (161) (881) (1,785) (2,003) (294) (114) (118) (219)  
Ending balance 2,587 2,518 2,840 3,626 5,223 5,530 5,061 5,202 2,587
Allowance for credit loss 2,587 2,518 2,840 3,626 5,223 5,530 5,061 5,202 2,587
Loans 26,300       56,100       26,300
Single-family rental loans                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance 1,331 1,237 1,340 1,277 1,314 1,292 1,302 1,451 1,277
Current provision/(reversal) 3,123 329 (103) 514 (37) 83 174 (122)  
Write-offs (99) (235) 0 (451) 0 (61) (184) (27)  
Ending balance 4,354 1,331 1,237 1,340 1,277 1,314 1,292 1,302 4,354
Allowance for credit loss 4,354 1,331 1,237 1,340 1,277 1,314 1,292 1,302 4,354
Loans 10,600               10,600
Seasoned performing loans                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance 28 42 46 48 49 46 45 46 48
Current provision/(reversal) (7) (14) (4) (2) (1) 3 1 (1)  
Write-offs 0 0 0 0 0 0 0 0  
Ending balance 21 28 42 46 48 49 46 45 21
Allowance for credit loss 21 28 42 46 48 49 46 45 21
Purchased Credit Deteriorated Loans                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance 20,601 20,210 20,905 21,407 23,411 23,398 21,579 22,780 21,407
Current provision/(reversal) (8,975) 501 (394) (389) (1,996) 120 1,877 (975)  
Write-offs (9) (110) (301) (113) (8) (107) (58) (226)  
Ending balance 11,617 20,601 20,210 20,905 21,407 23,411 23,398 21,579 11,617
Allowance for credit loss 11,617 $ 20,601 $ 20,210 20,905 21,407 $ 23,411 $ 23,398 $ 21,579 11,617
Loans 53,000       48,500       53,000
Unfunded Loan Commitment                  
Financing Receivable, Allowance for Credit Loss [Roll Forward]                  
Beginning balance       $ 29         29
Ending balance 0       29       0
Commitment to lend, unfunded 2,500       8,000       2,500
Allowance for credit loss $ 0       $ 29       $ 0