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Financing Agreements - Borrowings Under Repurchase Agreement and Associated Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 9,856,421 | $ 9,710,754
Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 2,657,267 | 2,466,787
Mark-to-market financing agreements secured by residential whole loans | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 1,476,667 | 1,544,086
Mark-to-market financing agreements secured by residential whole loans | Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 302,540 | 318,762
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 1,880,014 | $ 1,712,489
Weighted average haircut (percent) | 22.06% | 20.90%
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 2,420,430 | $ 2,204,239
Mark-to-market financing agreements secured by securities at fair value | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 605,673 | $ 622,603
Weighted average haircut (percent) | 8.39% | 8.07%
Mark-to-market financing agreements secured by securities at fair value | Held at Fair Value | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 682,199 | $ 689,818
Mark-to-market financing agreements secured by real estate owned | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 71,414 | 76,629
Mark-to-market financing agreements secured by real estate owned | Asset Pledged as Collateral with Right | Agreements with mark-to-market collateral provisions |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | 39,546 | 43,295
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 23,411 | $ 25,163
Weighted average haircut (percent) | 48.55% | 49.39%
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 45,502 | $ 50,365
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 1,102,114 | $ 1,216,697
Weighted average haircut (percent) | 18.99% | 17.65%
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 1,407,278 | $ 1,510,146
Non-mark-to-market financing secured by real estate owned | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 0 | $ 0
Weighted average haircut (percent) | 0.00% | 0.00%
Non-mark-to-market financing secured by real estate owned | Held at Fair Value | Asset Pledged as Collateral with Right |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Fair value of securities pledged as collateral under financing agreements | $ 0 | $ 0

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- Definition The weighted average percentage amount by which the collateral value is contractually required to exceed the loan amount on the Company's repurchase agreements borrowings. + References No definition available. + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-3 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 6: 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 7: 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)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-10 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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