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Loans Held for Investment - Loan risk rating - subnote (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Loans and Financing Receivable    
Allowance for Loan and Lease Losses, Real Estate $ 4,319,563 $ 3,738,758
Other    
Loans and Financing Receivable    
Allowance for Loan and Lease Losses, Real Estate $ 3,400,000 $ 2,500,000