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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 17, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35151    
Entity Registrant Name TPG MORTGAGE INVESTMENT TRUST, INC.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 27-5254382    
Entity Address, Address Line One 245 Park Avenue    
Entity Address, Address Line Two 26th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10167    
City Area Code 212    
Local Phone Number 692-2000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 214,436,323
Entity Common Stock, Shares Outstanding   31,735,457  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement relating to its 2026 annual meeting of stockholders, to be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.
    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001514281    
Amendment Flag false    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol MITT    
Security Exchange Name NYSE    
8.25% Series A Cumulative Redeemable Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security 8.25% Series A Cumulative Redeemable Preferred Stock    
Trading Symbol MITT PrA    
Security Exchange Name NYSE    
8.00% Series B Cumulative Redeemable Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security 8.00% Series B Cumulative Redeemable Preferred Stock    
Trading Symbol MITT PrB    
Security Exchange Name NYSE    
8.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock      
Document Information [Line Items]      
Title of 12(b) Security 8.000% Series C Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock    
Trading Symbol MITT PrC    
Security Exchange Name NYSE    
February 2029 Senior Unsecured Notes      
Document Information [Line Items]      
Title of 12(b) Security 9.500% Senior Notes due 2029    
Trading Symbol MITN    
Security Exchange Name NYSE    
May 2029 Senior Unsecured Notes      
Document Information [Line Items]      
Title of 12(b) Security 9.500% Senior Notes due 2029    
Trading Symbol MITP    
Security Exchange Name NYSE