v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 03, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Entity File Number 001-39958  
Entity Registrant Name TRINITY CAPITAL INC.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 35-2670395  
Entity Address, State or Province AZ  
Entity Address, Address Line One 1 N. 1st Street  
Entity Address, Address Line Two Suite 302  
Entity Address, City or Town Phoenix  
Entity Address, Postal Zip Code 85004  
City Area Code 480  
Local Phone Number 374‑5350  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   94,693,574
Entity Central Index Key 0001786108  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Interactive Data Current Yes  
Common Stock, par value $0.001 per share [Member] | New York Stock Exchange [Member]    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol TRIN  
Security Exchange Name NYSE  
Common Stock, par value $0.001 per share [Member] | NYSE Texas, Inc. [Member]    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol TRIN  
Security Exchange Name CHX  
7.875% Notes Due March 2029 [Member] | New York Stock Exchange [Member]    
Document Information [Line Items]    
Title of 12(b) Security 7.875% Notes Due March 2029  
Trading Symbol TRNZ  
Security Exchange Name NYSE  
7.875% Notes Due March 2029 [Member] | NYSE Texas, Inc. [Member]    
Document Information [Line Items]    
Title of 12(b) Security 7.875% Notes Due March 2029  
Trading Symbol TRNZ  
Security Exchange Name CHX  
7.875% Notes Due September 2029 [Member] | New York Stock Exchange [Member]    
Document Information [Line Items]    
Title of 12(b) Security 7.875% Notes Due September 2029  
Trading Symbol TRNI  
Security Exchange Name NYSE  
7.875% Notes Due September 2029 [Member] | NYSE Texas, Inc. [Member]    
Document Information [Line Items]    
Title of 12(b) Security 7.875% Notes Due September 2029  
Trading Symbol TRNI  
Security Exchange Name CHX