XML 11 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information Document - shares
 9 Months Ended
Sep. 30, 2021
Nov. 12, 2021
Cover [Abstract]    
Entity Registrant Name Terra Property Trust, Inc.  
Entity Central Index Key 0001674356  
Title of 12(b) Security 6.00% Notes due 2026  
Trading Symbol TPTA  
Security Exchange Name NYSE  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Document Type 10-Q  
Document Period End Date Sep. 30, 2021  
Entity File Number 000-56117  
Entity Tax Identification Number 81-0963486  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Ex Transition Period true  
Entity Current Reporting Status Yes  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Incorporation, State or Country Code MD  
Entity Address, Address Line One 550 Fifth Avenue  
Entity Address, Address Line Two 6th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10036  
City Area Code 212  
Local Phone Number 753-5100  
Document Transition Report false  
Document Quarterly Report true  
Entity Interactive Data Current Yes  
Entity Common Stock, Shares Outstanding   19,487,460