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Residential Whole Loans - Residential Whole Loans, at Carrying and Fair Value (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 1,550,234 |
Allowance for Credit Losses | (20,451) | $ (35,314)
Total Residential Whole Loans | $ 9,041,292 | $ 7,518,739
Number of loans | loan | 25,401 | 23,843
Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for Credit Losses | $ (20,451) | $ (35,314)
Total Residential Whole Loans | $ 1,529,784 | $ 1,791,215
Number of loans | loan | 6,326 | 7,126
Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Allowance for Credit Losses | $ 0 | $ 0
Total Residential Whole Loans | $ 7,511,508 | $ 5,727,524
Number of loans | loan | 19,075 | 16,717
Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 7,926,593 | $ 6,287,650
Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,120,509 | 1,356,235
Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 6,806,084 | 4,931,415
Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 705,424 | 796,109
Nonperforming | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 0 | 0
Nonperforming | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 705,424 | 796,109
Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 843,883 |
Non-QM loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 3,805,577 | 3,359,830
Non-QM loans | Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 843,884 | 987,282
Non-QM loans | Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 2,961,693 | 2,372,548
Transitional loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 35,467 |
Transitional loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 2,361,496 | 1,417,220
Transitional loans | Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 35,467 | 75,188
Transitional loans | Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 2,326,029 | 1,342,032
Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 172,213 |
Single-family rental loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,634,796 | 1,376,574
Single-family rental loans | Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 172,213 | 210,833
Single-family rental loans | Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,462,583 | 1,165,741
Seasoned performing loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 68,945 |
Seasoned performing loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 68,945 | 82,932
Seasoned performing loans | Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 68,945 | 82,932
Seasoned performing loans | Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 0 | 0
Agency eligible investor loans | Performing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 55,779 | 51,094
Agency eligible investor loans | Performing | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 0 | 0
Agency eligible investor loans | Performing | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 55,779 | 51,094
Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 429,726 | 470,294
Purchased Credit Deteriorated Loans | Held at Carrying Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 429,726 | 470,294
Purchased Credit Deteriorated Loans | Held at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 0 | 0
Single Family Residential Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,200,000 | 784,900
Multi-Family Transitional Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 1,200,000 | 632,300
New Construction Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | 471,100 | $ 283,100
Residential Whole Loans | Level 3 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, fair value | 13,600 |
Loss from changes in fair value | $ 1,200 |

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