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Fair value measurements - Summary of financial instruments measured at fair value (Details) - USD ($)
 12 Months Ended
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.