v3.26.1
Related party transactions - Expense Reimbursement (Details) - Expense reimbursements to Manager or its affiliates - Related Party - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Related Party Transaction [Line Items]        
Expense reimbursements to Manager or its affiliates $ 1,472 $ 1,508 $ 3,135 $ 3,807
Income Statement Location [Axis]: us-gaap:InvestmentIncomeInvestmentExpense        
Related Party Transaction [Line Items]        
Expense reimbursements to Manager or its affiliates 216 95 358 295
Income Statement Location [Axis]: mitt:NonInvestmentRelatedExpenses        
Related Party Transaction [Line Items]        
Expense reimbursements to Manager or its affiliates 1,183 1,304 2,629 3,143
Income Statement Location [Axis]: mitt:TransactionRelatedExpensesReversalOfExpense        
Related Party Transaction [Line Items]        
Expense reimbursements to Manager or its affiliates $ 73 $ 109 $ 148 $ 369