v3.26.1
Financing - Schedule of Financing Arrangements (Details) - USD ($)
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Repurchase Agreements [Abstract]    
Current Face $ 7,555,571,000  
Outstanding financing arrangements $ 7,343,110,000 $ 8,100,775,000
Weighted Average Funding Cost 5.36%  
Weighted Average Life (Years) 4 years 11 months 4 days  
Cash pledged under repurchase agreement $ 8,000,000.0 7,800,000
Asset Pledged as Collateral    
Repurchase Agreements [Abstract]    
Collateral Fair Value 1,314,349,000  
Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: us-gaap:CollateralizedFinancings    
Repurchase Agreements [Abstract]    
Current Face 6,565,056,000  
Outstanding financing arrangements $ 6,355,237,000 7,177,923,000
Weighted Average Funding Cost 5.33%  
Weighted Average Life (Years) 5 years 4 months 13 days  
Total Financing Arrangements    
Repurchase Agreements [Abstract]    
Current Face $ 891,015,000  
Total Financing Arrangements | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 891,015,000  
Outstanding financing arrangements $ 891,015,000 826,394,000
Weighted Average Funding Cost 5.03%  
Weighted Average Life (Years) 3 months 18 days  
Total Financing Arrangements | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 1,314,349,000  
Non-Agency Loans    
Repurchase Agreements [Abstract]    
Current Face 5,896,000  
Non-Agency Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 5,896,000  
Outstanding financing arrangements $ 5,896,000 29,817,000
Weighted Average Funding Cost 5.40%  
Weighted Average Life (Years) 11 months 8 days  
Non-Agency Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 7,014,000  
Non-Agency Loans | Securitized Residential Mortgage Loans    
Repurchase Agreements [Abstract]    
Current Face 408,463,000  
Notional balance 3,200,000,000  
Non-Agency Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: us-gaap:CollateralizedFinancings    
Repurchase Agreements [Abstract]    
Current Face 5,828,156,000  
Outstanding financing arrangements $ 5,606,863,000 6,265,540,000
Weighted Average Funding Cost 5.33%  
Weighted Average Life (Years) 5 years 8 months 15 days  
Non-Agency Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face $ 408,463,000  
Outstanding financing arrangements $ 408,463,000 428,657,000
Weighted Average Funding Cost 5.05%  
Weighted Average Life (Years) 1 month 28 days  
Non-Agency Loans | Securitized Residential Mortgage Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 610,177,000  
Non-Agency Loans | Counterparty One and Two    
Repurchase Agreements [Abstract]    
Maximum borrowing capacity 1,600,000,000  
Maximum borrowing capacity committed by lender 50,000,000  
Home Equity Loans    
Repurchase Agreements [Abstract]    
Current Face 141,575,000  
Home Equity Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 141,575,000  
Outstanding financing arrangements $ 141,575,000 58,951,000
Weighted Average Funding Cost 5.60%  
Weighted Average Life (Years) 11 months 23 days  
Maximum borrowing capacity $ 50,000,000  
Fair value of collateral pledged 63,500,000  
Outstanding financing 0  
Home Equity Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value 233,810,000  
Home Equity Loans | Securitized Residential Mortgage Loans    
Repurchase Agreements [Abstract]    
Current Face 62,168,000  
Notional balance 238,800,000  
Home Equity Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: us-gaap:CollateralizedFinancings    
Repurchase Agreements [Abstract]    
Current Face 643,739,000  
Outstanding financing arrangements $ 660,721,000 817,889,000
Weighted Average Funding Cost 5.54%  
Weighted Average Life (Years) 2 years 1 month 28 days  
Home Equity Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face $ 62,168,000  
Outstanding financing arrangements $ 62,168,000 67,752,000
Weighted Average Funding Cost 4.51%  
Weighted Average Life (Years) 1 month 28 days  
Home Equity Loans | Securitized Residential Mortgage Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 75,677,000  
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans    
Repurchase Agreements [Abstract]    
Current Face 26,742,000  
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: us-gaap:CollateralizedFinancings    
Repurchase Agreements [Abstract]    
Current Face 93,161,000  
Outstanding financing arrangements $ 87,653,000 94,494,000
Weighted Average Funding Cost 3.50%  
Weighted Average Life (Years) 2 years 9 months 10 days  
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face $ 26,742,000  
Outstanding financing arrangements $ 26,742,000 27,264,000
Weighted Average Funding Cost 5.73%  
Weighted Average Life (Years) 1 month 24 days  
Re- and Non-Performing Loans | Securitized Residential Mortgage Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 40,425,000  
Agency-Eligible Loans    
Repurchase Agreements [Abstract]    
Current Face 18,152,000  
Agency-Eligible Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 18,152,000  
Outstanding financing arrangements $ 18,152,000 19,490,000
Weighted Average Funding Cost 5.35%  
Weighted Average Life (Years) 4 months 20 days  
Agency-Eligible Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 20,651,000  
Legacy WMC Commercial Loans | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 19,875,000  
Outstanding financing arrangements $ 19,875,000 27,436,000
Weighted Average Funding Cost 6.39%  
Weighted Average Life (Years) 2 months 19 days  
Legacy WMC Commercial Loans | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 49,254,000  
Non-Agency RMBS    
Repurchase Agreements [Abstract]    
Current Face 178,996,000  
Non-Agency RMBS | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 178,996,000  
Outstanding financing arrangements $ 178,996,000 137,386,000
Weighted Average Funding Cost 4.46%  
Weighted Average Life (Years) 1 month 17 days  
Non-Agency RMBS | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 220,010,000  
Legacy WMC CMBS    
Repurchase Agreements [Abstract]    
Current Face 18,998,000  
Legacy WMC CMBS | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 18,998,000  
Outstanding financing arrangements $ 18,998,000 18,540,000
Weighted Average Funding Cost 5.07%  
Weighted Average Life (Years) 1 month 20 days  
Legacy WMC CMBS | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 42,616,000  
Agency RMBS    
Repurchase Agreements [Abstract]    
Current Face 10,150,000  
Agency RMBS | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face 10,150,000  
Outstanding financing arrangements $ 10,150,000 10,857,000
Weighted Average Funding Cost 4.29%  
Weighted Average Life (Years) 2 months 19 days  
Agency RMBS | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 14,715,000  
Senior Notes    
Repurchase Agreements [Abstract]    
Current Face 99,500,000  
Outstanding financing arrangements $ 96,858,000 96,458,000
Weighted Average Funding Cost 10.61%  
Weighted Average Life (Years) 2 years 9 months 29 days  
Long-term debt, fair value $ 102,100,000  
February 2029 Senior Unsecured Notes    
Repurchase Agreements [Abstract]    
Current Face 34,500,000  
Outstanding financing arrangements $ 33,490,000 33,327,000
Weighted Average Funding Cost 10.79%  
Weighted Average Life (Years) 2 years 8 months 1 day  
May 2029 Senior Unsecured Notes    
Repurchase Agreements [Abstract]    
Current Face $ 65,000,000  
Outstanding financing arrangements $ 63,368,000 63,131,000
Weighted Average Funding Cost 10.52%  
Weighted Average Life (Years) 2 years 11 months 1 day  
Other Assets | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Current Face $ 0  
Outstanding financing arrangements $ 0 $ 244,000
Weighted Average Funding Cost 0.00%  
Weighted Average Life (Years) 0 years  
Other Assets | Asset Pledged as Collateral | Balance Sheet Location [Axis]: mitt:DebtLongTermAndShortTermCombinedAmountExcludingConvertibleSeniorNotes    
Repurchase Agreements [Abstract]    
Collateral Fair Value $ 0