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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans, total or weighted average - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 128,048	$ 102,354	$ 247,557	$ 201,820
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	8,087	8,672	15,225	17,681
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	102,925	74,872	200,500	144,603
Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	45,518	34,512	89,607	67,463
Performing | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	32,621	15,188	60,847	30,047
Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	23,141	16,413	44,455	29,739
Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,127	1,155	2,216	2,165
Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	518	7,604	3,375	15,189
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	17,036	18,810	31,832	39,536
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	24,258	27,136	48,758	58,554
Carrying Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	8,087	8,672	15,225	17,681
Carrying Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	16,171	18,464	33,533	40,873
Carrying Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	11,646	12,255	24,320	25,395
Carrying Value | Performing | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	518	1,271	1,138	4,837
Carrying Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	2,880	3,783	5,859	8,476
Carrying Value | Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,127	1,155	2,216	2,165
Carrying Value | Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Carrying Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	103,790	75,218	198,799	143,266
Fair Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Fair Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	86,754	56,408	166,967	103,730
Fair Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	33,872	22,257	65,287	42,068
Fair Value | Performing | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	32,103	13,917	59,709	25,210
Fair Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,261	12,630	38,596	21,263
Fair Value | Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Fair Value | Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	518	7,604	3,375	15,189
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 17,036	$ 18,810	$ 31,832	$ 39,536

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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

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