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Loans Held for Investment - Narratives - TDR (Details) - USD ($)
 1 Months Ended 3 Months Ended
Sep. 23, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
May 30, 2020
Troubled Debt Restructuring          
Principal Balance   $ 567,520,973   $ 480,151,151  
Charge-offs   0 $ 0    
Principal Forgiveness          
Troubled Debt Restructuring          
Financing Receivable, Troubled Debt Restructuring   13,700,000   $ 13,700,000  
Financing Receivable   13,800,000      
Principal Balance $ 13,600,000 13,700,000     $ 3,500,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 1,300,000        
Charge-offs 1,000,000        
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 400,000        
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income   $ 300,000      
Loans and Leases Receivable, Impaired, Description   Once classified as a TDR, the new senior loan is classified as an impaired loan until it is extinguished and the carrying value is evaluated at each reporting date for collectability based on the fair value of the underlying collateral. Since the fair value of the collateral is greater than the carrying value of the new senior loan, no specific allowance was recorded as of March 31, 2022.      
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 14,700,000