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Residential Whole Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Dec. 31, 2023
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	$ 0			$ 38			$ 0
Commitment to lend, unfunded	1,600			5,400			1,600
Residential whole loan
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13,271	$ 19,612	$ 20,451	31,035	$ 33,062	$ 35,314	20,451
Current provision/(reversal)	(1,942)	(1,079)	(460)	(1,252)	265	315
Write-offs	(672)	(5,262)	(379)	(1,226)	(2,292)	(2,567)
Ending balance	10,657	13,271	19,612	28,557	31,035	33,062	10,657
Residential whole loan | Business purpose loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loans	3,684,042						3,684,042	$ 3,996,292
Residential whole loan | Business purpose loans | Single-family transitional loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,301	1,699	2,588	2,840	3,626	5,223	2,588
Current provision/(reversal)	48	(317)	(473)	559	999	406
Write-offs	(181)	(81)	(416)	(881)	(1,785)	(2,003)
Ending balance	1,168	1,301	1,699	2,518	2,840	3,626	1,168
Residential whole loan | Business purpose loans | Single-family transitional loans | Collateral Dependent Methodology
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loans	18,900			28,700			18,900
Residential whole loan | Business purpose loans | Single-family rental loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	609	4,642	4,355	1,237	1,340	1,277	4,355
Current provision/(reversal)	205	978	228	329	(103)	514
Write-offs	(439)	(5,011)		(235)	0	(451)
Write-offs			59
Ending balance	375	609	4,642	1,331	1,237	1,340	375
Loans	1,473,062						1,473,062	1,634,796
Residential whole loan | Non-QM loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,355	1,681	1,870	6,706	7,145	7,359	1,870
Current provision/(reversal)	387	(326)	(189)	(2,627)	(233)	(214)
Write-offs	0	0	0	0	(206)	0
Ending balance	1,742	1,355	1,681	4,079	6,706	7,145	1,742
Loans	4,172,797						4,172,797	3,805,577
Residential whole loan | Legacy RPL/NPL loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10,006	11,590	11,638	20,252	20,951	21,455	11,638
Current provision/(reversal)	(2,582)	(1,414)	(26)	487	(398)	(391)
Write-offs	(52)	(170)	(22)	(110)	(301)	(113)
Ending balance	7,372	$ 10,006	$ 11,590	20,629	$ 20,252	$ 20,951	7,372
Loans	1,125,280						1,125,280	$ 1,204,095
Residential whole loan | Legacy RPL/NPL loans | Collateral Dependent Methodology
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loans	$ 39,300			$ 52,600			$ 39,300

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- Definition

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+ References

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 45
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-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

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