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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans, total or weighted average - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 114,415	$ 79,602	$ 316,235	$ 213,156
Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,916	10,504	25,597	30,097
Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	87,767	48,394	232,370	124,327
Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	40,658	23,891	108,121	68,047
Performing | Residential transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,342	9,918	49,389	23,914
Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	18,998	9,497	48,737	23,484
Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,227	1,728	3,392	5,260
Performing | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,542	3,360	22,731	3,622
Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	18,732	20,704	58,268	58,732
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	27,231	41,551	85,785	134,169
Carrying Value | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,916	10,504	25,597	30,097
Carrying Value | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,315	31,047	60,188	104,072
Carrying Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	13,646	17,437	39,041	59,789
Carrying Value | Performing | Residential transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	784	5,808	5,621	19,429
Carrying Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	3,658	6,074	12,134	19,594
Carrying Value | Performing | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,227	1,728	3,392	5,260
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	87,184	38,051	230,450	78,987
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	68,452	17,347	172,182	20,255
Fair Value | Performing | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	27,012	6,454	69,080	8,258
Fair Value | Performing | Residential transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	18,558	4,110	43,768	4,485
Fair Value | Performing | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	15,340	3,423	36,603	3,890
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	7,542	3,360	22,731	3,622
Fair Value | Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 18,732	$ 20,704	$ 58,268	$ 58,732

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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