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Loans Held for Investment - Summary of the Company's loan portfolio - subnote (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Loans | Dec. 31, 2020 USD ($) Loans
Loans and Financing Receivable |  |
Number Of Loans | Loans | 19 | 20
Principal Balance | $ 482,089,565 | $ 424,174,758
Principal amount | 373,228,429 | 241,152,827
Floating rate |  |
Loans and Financing Receivable |  |
Principal Balance | 389,281,253 | $ 367,838,966
Revolving line of credit |  |
Loans and Financing Receivable |  |
Principal Balance | 42,239,289 |
Principal amount | $ 25,299,713 |
Revolving line of credit | LIBOR |  |
Loans and Financing Receivable |  |
Debt Instrument, Basis Spread on Variable Rate | 3.25% |
Revolving line of credit | Floor rate |  |
Loans and Financing Receivable |  |
Debt Instrument, Basis Spread on Variable Rate | 4.00% |
Term Loan |  |
Loans and Financing Receivable |  |
Fixed rate | 5.25% | 5.25%
Principal Balance | $ 162,759,074 | $ 184,201,670
Principal amount | $ 93,595,027 | $ 107,584,451
Term Loan | LIBOR |  |
Loans and Financing Receivable |  |
Debt Instrument, Basis Spread on Variable Rate | 4.25% | 4.25%
Term Loan | Floor rate | LIBOR |  |
Loans and Financing Receivable |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% | 1.00%
Term Loan | Floating rate | LIBOR |  |
Loans and Financing Receivable |  |
Debt Instrument, Basis Spread on Variable Rate | 0.08% | 0.14%
Number Of Loans | Loans | 12 | 12
Term Loan | Floating rate | Floor rate | LIBOR |  |
Loans and Financing Receivable |  |
Loans basis spread on variable rate | 1.00% |
Collateral | Revolving line of credit | Floating rate | Minimum |  |
Loans and Financing Receivable |  |
Fixed rate | 4.00% |

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