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Organization | 12 Months Ended
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Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Organization | Organization TPG Mortgage Investment Trust, Inc. (the "Company" or "MITT") is a residential mortgage REIT with a focus on investing in a diversified risk-adjusted portfolio of residential mortgage-related assets in the U.S. mortgage market. The Company’s investment activities primarily include acquiring and securitizing newly-originated residential mortgage loans within the non-agency segment of the housing market. The Company obtains its residential mortgage loans through Arc Home, LLC ("Arc Home"), a residential mortgage loan originator in which the Company owned an approximate 66.0% interest as of December 31, 2025, and through other third-party origination partners. The Company’s assets, excluding its ownership in Arc Home, include Residential Investments, Agency RMBS and Legacy WMC Commercial Investments. Currently, its Residential Investments primarily consist of Non-Agency Loans, Agency-Eligible Loans, Home Equity Loans, and Non-Agency RMBS collateralized by these loan types. The Company may invest in other types of residential mortgage loans and other mortgage related assets. The Company's asset classes are primarily comprised of the following:
Asset Class |  | Description
Residential Investments
Non-Agency Loans(1) |  | •Non-Agency Loans are loans that do not conform to the underwriting guidelines of a government-sponsored enterprise ("GSE"). Non-Agency Loans consist of Qualified mortgage loans ("QM Loans") and Non-Qualified mortgage loans ("Non-QM Loans") which are collateralized by a first lien mortgaged property. QM Loans are residential mortgage loans that comply with the Ability-To-Repay rules and related guidelines of the Consumer Financial Protection Bureau.
Agency-Eligible Loans(1) |  | •Agency-Eligible Loans are loans that are collateralized by a first lien mortgaged property and are primarily secured by investment properties. These loans are underwritten in accordance with GSE guidelines, but are not guaranteed by a GSE. Although these loans are underwritten in accordance with GSE guidelines and can be delivered to Fannie Mae and Freddie Mac, the Company includes these loans within its Non-Agency securitizations.
Home Equity Loans(1) |  | •Home Equity Loans consist of revolving lines of credit and closed-end loans secured primarily by second liens on residential mortgaged properties. These products provide borrowers with access to home equity without requiring the payoff of an existing mortgage. Revolving lines of credit generally feature an initial draw period of 3 to 5 years, after which the balances convert to 15- or 25-year amortizing loans. Closed-end home equity loans are primarily fixed-rate obligations where the full principal amount is funded at origination and repaid through a fully amortizing schedule with original terms to maturity ranging from 10 to 30 years.
Re- and Non-Performing Loans(1) |  | •Performing, re-performing, and non-performing loans are residential mortgage loans collateralized by a first lien mortgaged property.
Non-Agency RMBS(2) |  | •Non-Agency Residential Mortgage-Backed Securities ("RMBS") represent fixed- and floating-rate RMBS issued by entities other than U.S. GSEs or agencies of the U.S. government. Non-Agency RMBS are primarily secured by Non-QM, Agency-Eligible, Home Equity, and Prime Jumbo Loans.
Agency RMBS(2) |  | •Agency RMBS represent interests in pools of residential mortgage loans guaranteed by a GSE such as Fannie Mae or Freddie Mac, or an agency of the U.S. Government such as Ginnie Mae.
Legacy WMC Commercial Investments(3)
Commercial Loans |  | •Commercial loans represent first lien commercial mortgage loan participations.
CMBS(2) |  | •Commercial Mortgage-Backed Securities ("CMBS") represent fixed-rate and floating-rate CMBS, secured by, or evidencing an ownership interest in, a single commercial mortgage loan or a pool of commercial mortgage loans.
(1)These investments are included in the "Securitized residential mortgage loans, at fair value" or "Residential mortgage loans, at fair value" line items on the consolidated balance sheets. (2)These investments are included in the "Real estate securities, at fair value" line item on the consolidated balance sheets. (3)These investments include commercial loans and CMBS (collectively, the "Legacy WMC Commercial Investments") that were acquired in connection with the acquisition of Western Asset Mortgage Capital Corporation ("WMC") on December 6, 2023. The Company expects to either hold the Legacy WMC Commercial Investments until maturity or opportunistically exit these investments. The Company conducts its business through two reportable segments: (i) Loans and Securities and (ii) Arc Home. This reflects how the Company manages its business and analyzes and reports its results of operations. Refer to Note 13 for additional details on segment reporting. The Company was incorporated in the state of Maryland on March 1, 2011 and commenced operations in July 2011. The Company conducts its operations to qualify and be taxed as a real estate investment trust ("REIT") under the Internal Revenue Code of 1986, as amended (the "Code"). The Company is externally managed by AG REIT Management, LLC, a Delaware limited liability company (the "Manager"), a wholly-owned subsidiary of TPG Inc. ("TPG"). The Manager has delegated to Angelo, Gordon & Co., L.P. ("TPG Angelo Gordon"), an affiliate of TPG, the overall responsibility of its day-to-day duties and obligations arising under the management agreement. The consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries, and certain variable interest entities. All intercompany balances and transactions have been eliminated in consolidation.

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