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Related Party Transactions - Participation Interests Purchased - Subnote (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Jun. 27, 2018
Related Party Transaction      
Principal Balance $ 482,089,565 $ 424,174,758  
Terra Income Fund Six Inc      
Related Party Transaction      
Participating Interests     25.00%
Principal Balance     $ 4,300,000
Terra Income Fund Six Inc | Mezzanine Loans      
Related Party Transaction      
Principal Balance     $ 17,000,000