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Financing Agreements - Borrowings Under Repurchase Agreement and Associated Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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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 | $ 10,794,350 | $ 10,170,472
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 | 2,926,181 | 2,516,502
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 | 8,748,064 | 8,734,115
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 | 928,382 | 1,107,079
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 1,230,756 | $ 1,295,653
Weighted average haircut (percent) | 20.81% | 19.24%
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 | $ 1,554,603 | $ 1,608,344
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 | $ 1,878,417 | $ 1,279,007
Weighted average haircut (percent) | 4.13% | 4.99%
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 | $ 1,960,923 | $ 1,352,918
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 | 85,363 | 83,439
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 | 36,876 | 56,505
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 19,106 | $ 25,390
Weighted average haircut (percent) | 47.51% | 55.71%
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 | $ 41,645 | $ 62,659
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 166,126 | $ 576,774
Weighted average haircut (percent) | 18.15% | 21.40%
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 | $ 208,911 | $ 740,494
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
Non-agency MBS | Agreements with mark-to-market collateral provisions |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | 482,900 | 394,900
Fair value of securities pledged as collateral under financing agreements | $ 627,800 | $ 506,600

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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 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-20 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-15 Reference 4: 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 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 7: 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/1943274/2147477271/946-320-S99-2 Reference 8: 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/1943274/2147477271/946-320-S99-1 Reference 9: 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/1943274/2147477271/946-320-S99-6 Reference 10: 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/1943274/2147477271/946-320-S99-3 Reference 11: 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 12: 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 + Details
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