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Repurchase Agreements - Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Assets Sold under Agreements to Repurchase [Line Items] |  |
Outstanding Repurchase Agreements | $ 1,490,996 | $ 50,077
Value of Assets Pledged | 2,993,895 | 3,525,080
Repurchase agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Outstanding Repurchase Agreements | 1,490,996 | 50,077
Value of Assets Pledged | 1,672,262 | 170,551
Amortized Cost of Collateral Pledged | 1,771,205 | 210,733
Agency RMBS | Repurchase agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Outstanding Repurchase Agreements | 1,406,824 | 0
Value of Assets Pledged | 1,487,394 | 0
Amortized Cost of Collateral Pledged | 1,525,702 | 0
Non-Agency RMBS | Repurchase agreements |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Outstanding Repurchase Agreements | 84,172 | 50,077
Value of Assets Pledged | 184,868 | 170,551
Amortized Cost of Collateral Pledged | 245,503 | $ 210,733
Non-Agency RMBS | Repurchase agreements | Residential Loan Securitizations |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Amortized Cost of Collateral Pledged | 48,200 |
Non-Agency RMBS | Repurchase agreements | Consolidated SLST |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Amortized Cost of Collateral Pledged | $ 136,700 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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- Definition Amount of 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 -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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