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Residential Loans - Characteristics of Loans Held-for-Investment (Details) - Residential loans, held-for-investment $ in Thousands | 12 Months Ended
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Dec. 31, 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 | 1,583 | 1,908
Unpaid principal balance | $ 264,057 | $ 333,474
Loans, at fair value | $ 230,455 | $ 285,935
Weighted average coupon (as a percent) | 1.54% | 1.67%
Number of loans in foreclosure | loan | 10 | 21
Loans held as assets amount in foreclosure | $ 2,188 | $ 4,939
Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of Loans | loan | 4,300 | 2,177
Unpaid principal balance | $ 3,605,469 | $ 1,550,454
Loans, at fair value | $ 3,628,465 | $ 1,565,322
Weighted average coupon (as a percent) | 3.14% | 4.64%
Number of loans in foreclosure | loan | 2 | 3
Loans held as assets amount in foreclosure | $ 1,624 | $ 2,251
Freddie Mac SLST(1) |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of Loans | loan | 11,986 | 13,605
Unpaid principal balance | $ 1,932,241 | $ 2,247,771
Loans, at fair value | $ 1,888,230 | $ 2,221,153
Weighted average coupon (as a percent) | 4.51% | 4.52%
Number of loans in foreclosure | loan | 241 | 245
Loans held as assets amount in foreclosure | $ 43,637 | $ 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 past due | loan | 32 | 52
Loans held as assets, 90 days or more past due | $ 7,482 | $ 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 past due | loan | 18 | 94
Loans held as assets, 90 days or more past due | $ 15,124 | $ 74,742
Financing Receivables, Equal to Greater than 90 Days Past Due | Freddie Mac SLST(1) |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans past due | loan | 1,208 | 2,110
Loans held as assets, 90 days or more past due | $ 212,961 | $ 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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