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Financing Agreements - Borrowings Under Repurchase Agreement And Associated Assets Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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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 | $ 9,180,009 | $ 8,057,175
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 | 1,598,579 | 1,814,780
Mark-to-market financing agreements secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 1,725,473 | $ 2,095,002
Weighted average haircut (percent) | 19.18% | 18.33%
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 | $ 2,172,992 | $ 2,632,489
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 | $ 608,996 | $ 111,651
Weighted average haircut (percent) | 9.28% | 37.43%
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 | $ 678,801 | $ 177,111
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 | 78,938 | 84,813
Mark-to-market financing agreements secured by real estate owned | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 27,018 | $ 16,394
Weighted average haircut (percent) | 48.66% | 48.07%
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 | $ 53,715 | $ 33,367
Non-mark-to-market financing secured by residential whole loans | Held at Fair Value |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Carrying value | $ 1,124,953 | $ 994,494
Weighted average haircut (percent) | 17.43% | 21.43%
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 | $ 1,385,261 | $ 1,301,685
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 | $ 9,109
Weighted average haircut (percent) | 0.00% | 60.23%
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 | $ 22,902

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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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- Definition Fair value of securities pledged as collateral against securities sold under agreement to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-12 + Details
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