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Residential Loans - Characteristics of Loans Held-for-Investment (Details) - Held-for-investment at fair value $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1,372 | 1,583
Unpaid principal balance | $ 218,298 | $ 264,057
Fair value of loans | $ 198,160 | $ 230,455
Weighted average coupon (as a percent) | 3.23% | 1.87%
Number of loans in foreclosure | loan | 16 | 10
Unpaid principal balance of loans in foreclosure | $ 1,852 | $ 2,188
Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 4,666 | 4,300
Unpaid principal balance | $ 3,902,938 | $ 3,605,469
Fair value of loans | $ 3,237,170 | $ 3,628,465
Weighted average coupon (as a percent) | 3.25% | 3.39%
Number of loans in foreclosure | loan | 6 | 2
Unpaid principal balance of loans in foreclosure | $ 5,928 | $ 1,624
Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 11,054 | 11,986
Unpaid principal balance | $ 1,753,301 | $ 1,932,241
Fair value of loans | $ 1,482,964 | $ 1,888,230
Weighted average coupon (as a percent) | 4.50% | 4.51%
Number of loans in foreclosure | loan | 332 | 241
Unpaid principal balance of loans in foreclosure | $ 56,755 | $ 43,637
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 | 33 | 32
Fair value of loans with 90+ day delinquencies | $ 5,532 | $ 7,482
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 | 13 | 18
Fair value of loans with 90+ day delinquencies | $ 11,404 | $ 15,124
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 | 1,295 | 1,208
Fair value of loans with 90+ day delinquencies | $ 223,260 | $ 212,961

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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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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