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Residential Loans - Characteristics of Loans Held-for-Investment (Details) - Held-for-investment at fair value $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1,653 | 1,908
Unpaid principal balance | $ 278,815 | $ 333,474
Fair value of loans | $ 242,234 | $ 285,935
Number of loans in foreclosure | loan | 18 | 21
Unpaid principal balance of loans in foreclosure | $ 4,416 | $ 4,939
Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 3,022 | 2,177
Unpaid principal balance | $ 2,447,402 | $ 1,550,454
Fair value of loans | $ 2,479,750 | $ 1,565,322
Number of loans in foreclosure | loan | 4 | 3
Unpaid principal balance of loans in foreclosure | $ 2,863 | $ 2,251
Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 12,444 | 13,605
Unpaid principal balance | $ 2,022,724 | $ 2,247,771
Fair value of loans | $ 1,999,405 | $ 2,221,153
Number of loans in foreclosure | loan | 305 | 245
Unpaid principal balance of loans in foreclosure | $ 52,319 | $ 38,610
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 | 40 | 52
Fair value of loans with 90+ day delinquencies | $ 14,038 | $ 17,285
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 | 30 | 94
Fair value of loans with 90+ day delinquencies | $ 24,438 | $ 74,742
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 | 1,168 | 2,110
Fair value of loans with 90+ day delinquencies | $ 209,913 | $ 389,245

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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 http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + 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 http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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