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Fair value measurements - Summary of valuation techniques (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 260,304 $ 201,360
Other assets 50,016 30,778
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 50,016 30,778
Level 3 | Residential Mortgage | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 198,596 $ 218,388
Level 3 | Residential Mortgage | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0539 0.0644
Level 3 | Residential Mortgage | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1161 0.1563
Level 3 | Residential Mortgage | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0708 0.0776
Level 3 | Residential Mortgage | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0198 0.0129
Level 3 | Residential Mortgage | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.3346 0.3203
Level 3 | Residential Mortgage | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1606 0.1765
Level 3 | Residential Mortgage | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0000 0.0000
Level 3 | Residential Mortgage | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1829 0.2656
Level 3 | Residential Mortgage | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0147 0.0100
Level 3 | Residential Mortgage | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0443 0.0445
Level 3 | Residential Mortgage | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 1.0000 0.2500
Level 3 | Residential Mortgage | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1779 0.1727
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 7,999,619 $ 6,197,678
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0513 0.0575
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1810 0.1118
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0578 0.0626
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0492 0.0495
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.2200 0.1448
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1009 0.0887
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0000 0.0000
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0177 0.0202
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0009 0.0008
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.1000 0.1000
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 1.0000 0.2600
Level 3 | Residential Mortgage | Securitized Residential Mortgage Loans | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.2823 0.1951
Level 3 | Legacy WMC Commercial loans | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 55,376 $ 67,005
Level 3 | Legacy WMC Commercial loans | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0595 0.0806
Level 3 | Legacy WMC Commercial loans | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0695 0.0963
Level 3 | Legacy WMC Commercial loans | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0668 0.0911
Level 3 | Legacy WMC Commercial loans | Credit Spread | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0231 0.0377
Level 3 | Legacy WMC Commercial loans | Credit Spread | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0325 0.0512
Level 3 | Legacy WMC Commercial loans | Credit Spread | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.0300 0.0467
Level 3 | Legacy WMC Commercial loans | Recovery Percentage | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.6833 1.0000
Level 3 | Legacy WMC Commercial loans | Recovery Percentage | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.9329 1.0000
Level 3 | Legacy WMC Commercial loans | Recovery Percentage | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.8662 1.0000
Level 3 | Non-Agency RMBS | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 191,546 $ 115,533
Level 3 | Non-Agency RMBS | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0483 0.0586
Level 3 | Non-Agency RMBS | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.2000 0.2500
Level 3 | Non-Agency RMBS | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0756 0.0790
Level 3 | Non-Agency RMBS | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0755 0.0737
Level 3 | Non-Agency RMBS | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.1523 0.1450
Level 3 | Non-Agency RMBS | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.1123 0.1146
Level 3 | Non-Agency RMBS | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0000 0.0000
Level 3 | Non-Agency RMBS | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0038 0.0018
Level 3 | Non-Agency RMBS | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0006 0.0004
Level 3 | Non-Agency RMBS | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.1000 0.1000
Level 3 | Non-Agency RMBS | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 1.0000 0.2500
Level 3 | Non-Agency RMBS | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.5687 0.1817
Level 3 | Other assets | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets $ 0 $ 204
Level 3 | Other assets | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0659
Level 3 | Other assets | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0770
Level 3 | Other assets | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0672
Level 3 | Other assets | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.1152
Level 3 | Other assets | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.2578
Level 3 | Other assets | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.1909
Level 3 | Other assets | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0002
Level 3 | Other assets | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0273
Level 3 | Other assets | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.0071
Level 3 | Other assets | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.1000
Level 3 | Other assets | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.1000
Level 3 | Other assets | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.1000
Level 3 | Other assets | Pull Through Percentages | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.6500
Level 3 | Other assets | Pull Through Percentages | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   1.0000
Level 3 | Other assets | Pull Through Percentages | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets, measurement input   0.8933
Level 3 | AG Arc | Comparable Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 50,016 $ 30,778
Level 3 | AG Arc | Book Value Multiple | Minimum | Comparable Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 1.025 0.95
Level 3 | AG Arc | Book Value Multiple | Maximum | Comparable Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 1.025 0.95
Level 3 | AG Arc | Book Value Multiple | Weighted Average | Comparable Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 1.025 0.95
Level 3 | Securitized Debt | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, fair value $ (7,177,923) $ (5,491,967)
Level 3 | Securitized Debt | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0437 0.0511
Level 3 | Securitized Debt | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.3000 0.2500
Level 3 | Securitized Debt | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0542 0.0586
Level 3 | Securitized Debt | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0492 0.0495
Level 3 | Securitized Debt | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.2200 0.1448
Level 3 | Securitized Debt | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.1009 0.0885
Level 3 | Securitized Debt | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0000 0.0000
Level 3 | Securitized Debt | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0050 0.0050
Level 3 | Securitized Debt | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.0008 0.0007
Level 3 | Securitized Debt | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.1000 0.1000
Level 3 | Securitized Debt | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 1.0000 0.2600
Level 3 | Securitized Debt | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Long-term debt, measurement input 0.2779 0.1963
Level 3 | Other liabilities | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities $ 0 $ (336)
Level 3 | Other liabilities | Yield | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0658
Level 3 | Other liabilities | Yield | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0696
Level 3 | Other liabilities | Yield | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0667
Level 3 | Other liabilities | Projected Collateral Prepayments | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0900
Level 3 | Other liabilities | Projected Collateral Prepayments | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.2694
Level 3 | Other liabilities | Projected Collateral Prepayments | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.1834
Level 3 | Other liabilities | Projected Collateral Losses | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0001
Level 3 | Other liabilities | Projected Collateral Losses | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0136
Level 3 | Other liabilities | Projected Collateral Losses | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.0017
Level 3 | Other liabilities | Measurement Input, Loss Severity [Member] | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.1000
Level 3 | Other liabilities | Measurement Input, Loss Severity [Member] | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.1000
Level 3 | Other liabilities | Measurement Input, Loss Severity [Member] | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.1000
Level 3 | Other liabilities | Pull Through Percentages | Minimum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.6500
Level 3 | Other liabilities | Pull Through Percentages | Maximum | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   1.0000
Level 3 | Other liabilities | Pull Through Percentages | Weighted Average | Discounted Cash Flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities, measurement input   0.9048