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Residential Whole Loans - Interest Income Components (Details) - Residential whole loan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 157,406	$ 140,538	$ 480,788	$ 388,096
Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	78,298	64,310	241,714	169,614
Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	28,486	22,259	86,746	57,321
Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	23,479	17,964	73,969	43,750
Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	26,333	24,087	80,999	68,543
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	58,467	51,724	173,077	141,330
Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,139	24,018	64,453	73,292
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	502	486	1,544	3,860
Held at Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,654	23,582	64,767	72,340
Held at Carrying Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	2,534	2,840	7,765	9,837
Held at Carrying Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	249	101	642	1,239
Held at Carrying Value | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Held at Carrying Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	2,285	2,739	7,123	8,598
Held at Carrying Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	10,357	12,276	33,306	36,595
Held at Carrying Value | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,763	8,466	23,696	25,908
Held at Carrying Value | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0	0	0
Held at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	136,752	116,956	416,021	315,756
Held at Fair Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	75,764	61,470	233,949	159,777
Held at Fair Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	28,237	22,158	86,104	56,082
Held at Fair Value | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	23,479	17,964	73,969	43,750
Held at Fair Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	24,048	21,348	73,876	59,945
Held at Fair Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	48,110	39,448	139,771	104,735
Held at Fair Value | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	12,376	15,552	40,757	47,384
Held at Fair Value | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 502	$ 486	$ 1,544	$ 3,860

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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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/1943274/2147478524/942-220-S99-1

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