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Collateralized Debt Obligations - Summary of Debt (Details) - Collateralized Debt Obligations - Secured Debt - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021
Debt Instrument [Line Items] |  |
Outstanding Face Amount | $ 1,547,963 | $ 1,575,242
Collateralized debt, carrying value | 1,623,658 | 1,615,078
Consolidated SLST |  |
Debt Instrument [Line Items] |  |
Outstanding Face Amount | 975,017 | 861,184
Collateralized debt, carrying value | $ 1,054,335 | $ 904,976
Weighted average interest rate | 2.75% | 2.75%
Weighted Average Rate of Notes Issued | 3.53% | 3.53%
Residential loan securitizations |  |
Debt Instrument [Line Items] |  |
Outstanding Face Amount | $ 557,497 | $ 714,058
Collateralized debt, carrying value | $ 554,067 | $ 710,102
Weighted average interest rate | 3.36% | 2.42%
Weighted Average Rate of Notes Issued | 4.83% | 3.38%
Non-Agency RMBS Re-Securitization |  |
Debt Instrument [Line Items] |  |
Outstanding Face Amount | $ 15,449 |
Collateralized debt, carrying value | $ 15,256 |
Non-Agency RMBS Re-Securitization | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate, basis spread | 0.0525% |

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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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