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Residential Consumer Loans - Schedule of Characteristics of Residential Consumer Loans Held-for-Investment (Details) - Held-for-investment at fair value - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance ("UPB")	$ 10,590,674	$ 9,350,286
Average loan balance (UPB)	871	842
Fair value of loans	$ 10,176,418	$ 8,819,554
Weighted average coupon	5.19%	5.35%
Unpaid principal balance of loans in foreclosure	$ 11,329	$ 10,493
Average foreclosure balance (UPB)	566	552
Freddie Mac SLST
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance ("UPB")	1,493,348	1,514,432
Average loan balance (UPB)	155	155
Fair value of loans	$ 1,281,550	$ 1,244,722
Weighted average coupon	4.49%	4.49%
Unpaid principal balance of loans in foreclosure	$ 37,180	$ 41,913
Average foreclosure balance (UPB)	183	185
Financing Receivables, Equal to Greater than 90 Days Past Due | Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance of loans with 90+ day delinquencies	25,541	19,480
Average 90+ days delinquent balance (UPB)	672	573
Financing Receivables, Equal to Greater than 90 Days Past Due | Freddie Mac SLST
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance of loans with 90+ day delinquencies	93,302	106,910
Average 90+ days delinquent balance (UPB)	$ 173	$ 172

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Fair Value, Option, Loans Held As Assets, Aggregate Amount In Foreclosure

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Fair Value, Option, Loans Held As Assets, Average Foreclosure Balance

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Loans Held-for-Investment, Average Loan Balance (UPB)

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Loans Held-for-Investment, Weighted Average Coupon Rate

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
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-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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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-SubTopic 210
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-Paragraph 1
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This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

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