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Residential Loans - Schedule of Characteristics of Residential Loans Held-for-Investment (Details) - Residential loans, held-for-investment, at fair value $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan
Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of Loans | loan | 1,059 | 1,304
Unpaid principal balance | $ 156,053 | $ 204,404
Fair value of loans | $ 139,739 | $ 184,932
Weighted average coupon (as a percent) | 6.54% | 4.51%
Number of loans in foreclosure | loan | 7 | 11
Loans held as assets amount in foreclosure | $ 1,848 | $ 1,166
Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of Loans | loan | 6,070 | 4,624
Unpaid principal balance | $ 5,242,860 | $ 3,847,091
Fair value of loans | $ 4,640,464 | $ 3,190,417
Weighted average coupon (as a percent) | 4.08% | 3.25%
Number of loans in foreclosure | loan | 5 | 5
Loans held as assets amount in foreclosure | $ 3,386 | $ 4,654
Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of Loans | loan | 10,302 | 10,882
Unpaid principal balance | $ 1,614,974 | $ 1,719,236
Fair value of loans | $ 1,359,242 | $ 1,457,058
Weighted average coupon (as a percent) | 4.50% | 4.50%
Number of loans in foreclosure | loan | 292 | 427
Loans held as assets amount in foreclosure | $ 47,654 | $ 72,440
Financing Receivables, Equal to Greater than 90 Days Past Due | Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans with 90+ day delinquencies | loan | 16 | 30
Fair value of loans with 90+ day delinquencies | $ 4,141 | $ 6,824
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] |  |
Number of loans with 90+ day delinquencies | loan | 11 | 10
Fair value of loans with 90+ day delinquencies | $ 8,882 | $ 7,799
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] |  |
Number of loans with 90+ day delinquencies | loan | 796 | 1,211
Fair value of loans with 90+ day delinquencies | $ 132,307 | $ 209,397

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- 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/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Publisher SEC Reference 2: 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//1943274/2147479851/948-310-S99-1 + Details
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- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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- Definition Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(5)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
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