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Residential Whole Loans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($)
Receivables [Abstract] |  |
Total residential whole loans | $ 7,900,000 | $ 5,300,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of whole loans sold | loan | 0 |
Nonperforming Financial Instruments |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, sale |  | 24,100
Loss on sale of financing receivable |  | 800
Financing receivable, nonaccrual | $ 588,100 | 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 | 240,200 | 373,300
Purchased Credit Deteriorated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | 108,900 | 151,400
Interest Income On Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | 21,200 | 15,500
Without Associated Credit Losses |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, nonaccrual | $ 107,400 | $ 130,700

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