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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 153,290	$ 157,406	$ 459,168	$ 480,788
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	76,742	58,467	212,273	173,077
Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	55,983	78,298	186,933	241,714
Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	21,636	26,333	65,780	80,999
Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	18,991	28,486	68,535	86,746
Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	15,356	23,479	52,618	73,969
Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,086	20,139	58,541	64,453
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	479	502	1,421	1,544
Held at Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	17,976	20,654	59,216	64,767
Held at Carrying Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	8,649	10,357	28,069	33,306
Held at Carrying Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,950	2,534	9,471	7,765
Held at Carrying Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,740	2,285	5,433	7,123
Held at Carrying Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	210	249	4,038	642
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 | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,377	7,763	21,676	23,696
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	135,314	136,752	399,952	416,021
Held at Fair Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	68,093	48,110	184,204	139,771
Held at Fair Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	54,033	75,764	177,462	233,949
Held at Fair Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,896	24,048	60,347	73,876
Held at Fair Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	18,781	28,237	64,497	86,104
Held at Fair Value | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	15,356	23,479	52,618	73,969
Held at Fair Value | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	12,709	12,376	36,865	40,757
Held at Fair Value | Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 479	$ 502	$ 1,421	$ 1,544

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+ 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://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

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-Name Accounting Standards Codification
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-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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