v3.26.1
Fair value measurements - Schedule of Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Assets:      
Derivative assets $ 9,995 $ 5,395  
Cash equivalents 58,897 55,979  
Other assets 1,705 0  
Total Assets Measured at Fair Value 7,857,000 8,626,366  
Liabilities:      
Securitized debt (6,355,237) (7,177,923)  
Derivative liabilities (145) (1,169)  
Total Liabilities Measured at Fair Value (6,355,382) (7,179,092)  
AG Arc      
Assets:      
AG Arc 46,435 50,016  
Interest Rate Swaps      
Assets:      
Derivative assets 151   $ 0
Liabilities:      
Derivative asset, reduction in fair value related to variation margin 9,800 5,300  
Derivative liabilities, reduction related to variation margin 100 1,200  
Residential mortgage loans | Securitized residential mortgage loans      
Assets:      
Mortgage loans [1] 7,119,175 7,999,619  
Residential mortgage loans | VIE, Not Primary Beneficiary      
Assets:      
Mortgage loans 262,285 199,677  
Legacy WMC Commercial Loans      
Assets:      
Legacy WMC Commercial Loans 49,254 55,376  
Non-Agency RMBS      
Assets:      
Debt securities, available for sale 251,845 201,381  
Legacy WMC CMBS      
Assets:      
Legacy WMC Commercial Loans 4,900 6,300  
Debt securities, available for sale 42,694 42,565  
Agency RMBS      
Assets:      
Debt securities, available for sale 14,715 16,358  
Level 1      
Assets:      
Derivative assets 0 0  
Cash equivalents 58,897 55,979  
Other assets 1,705 0  
Total Assets Measured at Fair Value 60,602 55,979  
Liabilities:      
Securitized debt 0 0  
Derivative liabilities 0 0  
Total Liabilities Measured at Fair Value 0 0  
Level 1 | AG Arc      
Assets:      
AG Arc 0 0  
Level 1 | Residential mortgage loans | Securitized residential mortgage loans      
Assets:      
Mortgage loans 0 0  
Level 1 | Residential mortgage loans | VIE, Not Primary Beneficiary      
Assets:      
Mortgage loans 0 0  
Level 1 | Legacy WMC Commercial Loans      
Assets:      
Legacy WMC Commercial Loans 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 9,995 5,395  
Cash equivalents 0 0  
Other assets 0 0  
Total Assets Measured at Fair Value 78,166 75,234  
Liabilities:      
Securitized debt 0 0  
Derivative liabilities (145) (1,169)  
Total Liabilities Measured at Fair Value (145) (1,169)  
Level 2 | AG Arc      
Assets:      
AG Arc 0 0  
Level 2 | Residential mortgage loans | Securitized residential mortgage loans      
Assets:      
Mortgage loans 0 0  
Level 2 | Residential mortgage loans | VIE, Not Primary Beneficiary      
Assets:      
Mortgage loans 810 1,081  
Level 2 | Legacy WMC Commercial Loans      
Assets:      
Legacy WMC Commercial Loans 0 0  
Level 2 | Non-Agency RMBS      
Assets:      
Debt securities, available for sale 9,952 9,835  
Level 2 | Legacy WMC CMBS      
Assets:      
Debt securities, available for sale 42,694 42,565  
Level 2 | Agency RMBS      
Assets:      
Debt securities, available for sale 14,715 16,358  
Level 3      
Assets:      
Derivative assets 0 0  
Cash equivalents 0 0  
Other assets 0 0  
Total Assets Measured at Fair Value 7,718,232 8,495,153  
Liabilities:      
Securitized debt (6,355,237) (7,177,923)  
Derivative liabilities 0 0  
Total Liabilities Measured at Fair Value (6,355,237) (7,177,923)  
Level 3 | AG Arc      
Assets:      
AG Arc 46,435 50,016  
Level 3 | Residential mortgage loans | Securitized residential mortgage loans      
Assets:      
Mortgage loans 7,119,175 7,999,619  
Level 3 | Residential mortgage loans | VIE, Not Primary Beneficiary      
Assets:      
Mortgage loans 261,475 198,596  
Level 3 | Legacy WMC Commercial Loans      
Assets:      
Legacy WMC Commercial Loans 49,254 55,376  
Level 3 | Non-Agency RMBS      
Assets:      
Debt securities, available for sale 241,893 191,546  
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.