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Residential Loans - Characteristics of Loans Held-for-Investment (Details) - Held-for-investment at fair value $ in Thousands | Sep. 30, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
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Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1,976 | 2,198
Unpaid principal balance | $ 352,392 | $ 424,829
Loans, at fair value | $ 296,765 | $ 407,890
Number of loans in foreclosure | loan | 21 | 16
Fair value of loans, in foreclosure | $ 4,820 | $ 3,673
Legacy Sequoia | Financing Receivables, Equal to Greater than 90 Days Past Due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans past due | loan | 49 | 39
Fair value of loans with 90+ day delinquencies | $ 16,076 | $ 9,803
Sequoia Choice |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 2,546 | 3,156
Unpaid principal balance | $ 1,811,967 | $ 2,240,679
Loans, at fair value | $ 1,836,361 | $ 2,291,463
Number of loans in foreclosure | loan | 3 | 3
Fair value of loans, in foreclosure | $ 1,814 | $ 2,290
Sequoia Choice | Financing Receivables, Equal to Greater than 90 Days Past Due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans past due | loan | 132 | 9
Fair value of loans with 90+ day delinquencies | $ 102,693 | $ 6,755
Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 13,893 | 14,502
Unpaid principal balance | $ 2,304,047 | $ 2,428,035
Loans, at fair value | $ 2,256,683 | $ 2,367,215
Number of loans in foreclosure | loan | 175 | 208
Fair value of loans, in foreclosure | $ 28,380 | $ 33,042
Freddie Mac SLST | Financing Receivables, Equal to Greater than 90 Days Past Due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans past due | loan | 1,772 | 587
Fair value of loans with 90+ day delinquencies | $ 339,537 | $ 134,680
Redwood |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 0 | 2,940
Unpaid principal balance | $ 0 | $ 2,052,778
Loans, at fair value | $ 0 | $ 2,111,897
Number of loans in foreclosure | loan | 0 | 0
Fair value of loans, in foreclosure | $ 0 | $ 0
Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Unpaid principal balance | $ 0 | $ 1,424
Number of loans past due | loan | 0 | 2
Fair value of loans with 90+ day delinquencies | $ 0 | $ 1,585

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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=121599337&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=121593590&loc=d3e4428-111522 + Details
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