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Fair value measurements - Summary of financial instruments measured at fair value (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Assets: |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Other assets | Other assets
Derivative assets |  | $ 5,395,000 | $ 11,618,000
Cash equivalents |  | 55,979,000 | 117,979,000
AG Arc |  | 50,016,000 | 30,778,000
Total Assets Measured at Fair Value |  | 8,626,366,000 | 6,846,635,000
Liabilities: |  |  |
Securitized debt |  | (7,177,923,000) | (5,491,967,000)
Derivative liabilities |  | (1,169,000) | (374,000)
Total Liabilities Measured at Fair Value |  | (7,179,092,000) | (5,492,341,000)
Interest Rate Swaps |  |  |
Assets: |  |  |
Derivative assets |  | 149,000 | 0
Liabilities: |  |  |
Derivative asset, reduction in fair value related to variation margin |  | 5,300,000 | 11,400,000
Derivative liabilities, reduction related to variation margin |  | 1,200,000 | 35,000.0
Residential Mortgage | Securitized Residential Mortgage Loans |  |  |
Assets: |  |  |
Mortgage loans | [1] | 7,999,619,000 | 6,197,678,000
Residential Mortgage | VIE, Not Primary Beneficiary |  |  |
Assets: |  |  |
Mortgage loans |  | 199,677,000 | 220,217,000
Legacy WMC Commercial loans |  |  |
Assets: |  |  |
Fair Value |  | 55,376,000 | 67,005,000
Non-Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 201,381,000 | 127,579,000
Legacy WMC CMBS |  |  |
Assets: |  |  |
Fair Value |  | 6,300,000 | 6,000,000.0
Debt securities, available for sale |  | 42,565,000 | 52,785,000
Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 16,358,000 | 20,996,000
Level 1 |  |  |
Assets: |  |  |
Derivative assets |  | 0 | 0
Cash equivalents |  | 55,979,000 | 117,979,000
AG Arc |  | 0 | 0
Total Assets Measured at Fair Value |  | 55,979,000 | 117,979,000
Liabilities: |  |  |
Securitized debt |  | 0 | 0
Derivative liabilities |  | 0 | 0
Total Liabilities Measured at Fair Value |  | 0 | 0
Level 1 | Residential Mortgage | Securitized Residential Mortgage Loans |  |  |
Assets: |  |  |
Mortgage loans |  | 0 | 0
Level 1 | Residential Mortgage | VIE, Not Primary Beneficiary |  |  |
Assets: |  |  |
Mortgage loans |  | 0 | 0
Level 1 | Legacy WMC Commercial loans |  |  |
Assets: |  |  |
Fair Value |  | 0 | 0
Level 1 | Non-Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 0 | 0
Level 1 | Legacy WMC CMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 0 | 0
Level 1 | Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Derivative assets |  | 5,395,000 | 11,414,000
Cash equivalents |  | 0 | 0
AG Arc |  | 0 | 0
Total Assets Measured at Fair Value |  | 75,234,000 | 99,070,000
Liabilities: |  |  |
Securitized debt |  | 0 | 0
Derivative liabilities |  | (1,169,000) | (38,000)
Total Liabilities Measured at Fair Value |  | (1,169,000) | (38,000)
Level 2 | Residential Mortgage | Securitized Residential Mortgage Loans |  |  |
Assets: |  |  |
Mortgage loans |  | 0 | 0
Level 2 | Residential Mortgage | VIE, Not Primary Beneficiary |  |  |
Assets: |  |  |
Mortgage loans |  | 1,081,000 | 1,829,000
Level 2 | Legacy WMC Commercial loans |  |  |
Assets: |  |  |
Fair Value |  | 0 | 0
Level 2 | Non-Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 9,835,000 | 12,046,000
Level 2 | Legacy WMC CMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 42,565,000 | 52,785,000
Level 2 | Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 16,358,000 | 20,996,000
Level 3 |  |  |
Assets: |  |  |
Derivative assets |  | 0 | 204,000
Cash equivalents |  | 0 | 0
AG Arc |  | 50,016,000 | 30,778,000
Total Assets Measured at Fair Value |  | 8,495,153,000 | 6,629,586,000
Liabilities: |  |  |
Securitized debt |  | (7,177,923,000) | (5,491,967,000)
Derivative liabilities |  | 0 | (336,000)
Total Liabilities Measured at Fair Value |  | (7,177,923,000) | (5,492,303,000)
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans |  |  |
Assets: |  |  |
Mortgage loans |  | 7,999,619,000 | 6,197,678,000
Level 3 | Residential Mortgage | VIE, Not Primary Beneficiary |  |  |
Assets: |  |  |
Mortgage loans |  | 198,596,000 | 218,388,000
Level 3 | Legacy WMC Commercial loans |  |  |
Assets: |  |  |
Fair Value |  | 55,376,000 | 67,005,000
Level 3 | Non-Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 191,546,000 | 115,533,000
Level 3 | Legacy WMC CMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | 0 | 0
Level 3 | Agency RMBS |  |  |
Assets: |  |  |
Debt securities, available for sale |  | $ 0 | $ 0
[1] | These balances relate to certain residential mortgage loans which were securitized resulting in the Company consolidating the variable interest entities that were created to facilitate these securitizations as the Company was determined to be the primary beneficiary. The "Securitized debt, at fair value" is collateralized by the "Securitized residential mortgage loans, at fair value" held within the securitization trusts. See Note 3 and Note 6 for additional details.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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