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Residential Whole Loans (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Receivables [Abstract] |  |  |  |
Total residential whole loans | $ 7,100,000 | $ 7,100,000 |  | $ 5,300,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of whole loans sold | loan | 0 | 0 |  |
Nonperforming |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, sale |  |  | $ 24,100 |
Loss on sale of financing receivable |  |  | 800 |
Financing receivable, nonaccrual | $ 624,900 | $ 624,900 |  | 730,900
Non-QM loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, sale |  |  | 1,800,000 |
Loss on sale of financing receivable |  |  | $ 273,000 |
Purchased Performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, nonaccrual | 275,900 | 275,900 |  | 373,300
Purchased credit deteriorated loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, nonaccrual | 113,000 | 113,000 |  | 151,400
Without Associated Credit Losses |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, nonaccrual | $ 122,300 | $ 122,300 |  | $ 130,700

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