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Loans Held for Investment - Narratives - TDR (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 23, 2021
Apr. 01, 2022
Dec. 31, 2022
Dec. 31, 2021
May 30, 2020
Troubled Debt Restructuring            
Debt instrument, face $ 451,349,737     $ 451,349,737 $ 370,566,055  
Repayments of loan       2,710,384 12,057,533  
Converted to subordinated equity       1,400,000    
Fair value 623,145,754     623,145,754 467,201,619  
Principal balance 645,795,459     645,795,459 480,151,151  
Charge-offs       0 984,440  
Senior Loans            
Troubled Debt Restructuring            
Debt instrument, face 40,100,000     40,100,000    
Repayments of loan 38,700,000          
Converted to subordinated equity       $ 1,400,000    
Accrues dividends rate       8.00%    
Principal Forgiveness            
Troubled Debt Restructuring            
Investment in troubled debt restructuring $ 1     $ 1 13,700,000  
Interest accrual suspended           $ 3,500,000
Principal balance   $ 13,600,000     13,600,000  
Financing receivable, troubled debt restructuring, commitment to lend   14,700,000        
Charge-offs   1,000,000        
Accrued interest forgiven   1,300,000        
Interest non-accrual   $ 400,000 $ 300,000   $ 300,000