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Loans Held for Investment - Allowance for loan losses (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Receivables [Abstract]    
Allowance for loan losses, beginning of period $ 13,658,481 $ 3,738,758
Provision for loan losses 50,296 276,020
Charge-offs 0 0
Recoveries 0 0
Allowance for loan losses, end of period $ 13,708,777 $ 4,014,778