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Residential Whole Loans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total residential whole loans | $ 9,000,000 | $ 7,500,000
Interest income on nonaccrual loans | $ 14,900 |
Number of loan modifications | loan | 4 |
Average increase in weighted life | 23 months |
Loan carrying value | $ 563 |
90 or more |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loan modifications | loan | 1 |
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loan modifications | loan | 3 |
Nonperforming |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | $ 315,400 | 413,100
Interest income on nonaccrual loans | 9,800 |
Agency eligible investor loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, sale |  | 337,800
Loss on sale of financing receivable |  | 72,300
Amount derecognized |  | 598,000
Non-QM loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, sale |  | 101,200
Loss on sale of financing receivable |  | 26,400
Purchased Performing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | 266,900 | 195,100
Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | 66,500 | 80,500
Without Associated Credit Losses |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | $ 51,600 | $ 71,700

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