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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 151,310	$ 157,665
Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	68,169	80,318
Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	25,818	28,018
Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,954	25,198
Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	22,397	27,102
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	65,264	55,861
Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	17,379	20,969
Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	498	517
Held at Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,742	21,701
Held at Carrying Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	3,614	2,802
Held at Carrying Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,714	241
Held at Carrying Value | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0
Held at Carrying Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	1,900	2,561
Held at Carrying Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	10,086	11,420
Held at Carrying Value | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	7,042	7,479
Held at Carrying Value | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	0	0
Held at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	130,568	135,964
Held at Fair Value | Business purpose loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	64,555	77,516
Held at Fair Value | Business purpose loans | Single-family transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	24,104	27,777
Held at Fair Value | Business purpose loans | Multifamily transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	19,954	25,198
Held at Fair Value | Business purpose loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	20,497	24,541
Held at Fair Value | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	55,178	44,441
Held at Fair Value | Legacy RPL/NPL loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	10,337	13,490
Held at Fair Value | Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income	$ 498	$ 517

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- Definition

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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://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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