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Residential Whole Loans - Interest Income Components (Details) - Residential Whole Loans - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | $ 537,883 | $ 441,223 | $ 303,468
Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 445,773 | 329,276 | 182,597
Nonperforming |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 62,464 | 78,520 | 80,741
Non-QM loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 193,327 | 149,743 | 96,948
Transitional loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 149,429 | 75,524 | 33,129
Single-family rental loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 94,141 | 68,975 | 34,169
Seasoned performing loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 4,504 | 4,673 | 6,684
Agency eligible investor loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 4,372 | 30,361 | 11,667
Purchased Credit Deteriorated Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 29,646 | 33,427 | 40,130
Held at Carrying Value |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 94,134 | 112,583 | 169,618
Held at Carrying Value | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 64,488 | 79,156 | 129,488
Held at Carrying Value | Nonperforming |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 0 | 0 | 0
Held at Carrying Value | Non-QM loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 47,471 | 51,359 | 75,517
Held at Carrying Value | Transitional loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 1,346 | 7,810 | 22,424
Held at Carrying Value | Single-family rental loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 11,167 | 15,314 | 24,863
Held at Carrying Value | Seasoned performing loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 4,504 | 4,673 | 6,684
Held at Carrying Value | Agency eligible investor loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 0 | 0 | 0
Held at Carrying Value | Purchased Credit Deteriorated Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 29,646 | 33,427 | 40,130
Held at Fair Value |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 443,749 | 328,640 | 133,850
Held at Fair Value | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 381,285 | 250,120 | 53,109
Held at Fair Value | Nonperforming |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 62,464 | 78,520 | 80,741
Held at Fair Value | Non-QM loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 145,856 | 98,384 | 21,431
Held at Fair Value | Transitional loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 148,083 | 67,714 | 10,705
Held at Fair Value | Single-family rental loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 82,974 | 53,661 | 9,306
Held at Fair Value | Seasoned performing loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 0 | 0 | 0
Held at Fair Value | Agency eligible investor loans | Performing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | 4,372 | 30,361 | 11,667
Held at Fair Value | Purchased Credit Deteriorated Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Interest income | $ 0 | $ 0 | $ 0

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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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