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Related Party Transactions - Transfers of Participation Interest (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]    
Principal Balance $ 645,795,459 $ 480,151,151
Carrying Value 626,490,767 469,673,314
Principal Balance 451,349,737 370,566,055
Carrying Value 25,000,000 91,940,062
Gain on extinguishment of obligations under participation agreements 3,435,902 0
Participating Mortgage Loan    
Related Party Transaction [Line Items]    
Principal Balance 18,625,738 100,619,048
Carrying Value 18,738,386 100,974,244
Principal Balance 12,584,958 42,048,294
Carrying Value 12,680,594 42,232,027
Participating Mortgage Loan | 610 Walnut Investors LLC    
Related Party Transaction [Line Items]    
Principal Balance 18,625,738  
Carrying Value $ 18,738,386  
% Transferred 67.57%  
Principal Balance $ 12,584,958  
Carrying Value $ 12,680,594  
Participating Mortgage Loan | 370 Lex Part Deux, LLC    
Related Party Transaction [Line Items]    
Principal Balance   60,012,639
Carrying Value   $ 60,012,639
% Transferred   35.00%
Principal Balance   $ 21,004,424
Carrying Value   21,004,423
Participating Mortgage Loan | RS JZ Driggs, LLC    
Related Party Transaction [Line Items]    
Principal Balance   15,606,409
Carrying Value   $ 15,754,641
% Transferred   50.00%
Principal Balance   $ 7,806,370
Carrying Value   7,880,516
Participating Mortgage Loan | William A. Shopoff & Cindy I. Shopoff    
Related Party Transaction [Line Items]    
Principal Balance   25,000,000
Carrying Value   $ 25,206,964
% Transferred   52.95%
Principal Balance   $ 13,237,500
Carrying Value   $ 13,347,088