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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

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