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Loans Held for Investment - Narratives - Allowance for loan losses (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($) Loans	Sep. 30, 2020 USD ($) Loans	Sep. 30, 2021 USD ($) Loans	Sep. 30, 2020 USD ($) Loans	Dec. 31, 2020 Loans
Loans and Financing Receivable
Number Of Loans | Loans	19		19		20
Financing Receivable, Credit Loss, Expense (Reversal)			$ (400,000)
Provision for loan losses	$ 716,164	$ 42,443	1,565,245	$ 1,356,737
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | Loans					1
Interest non-accrual	1,100,000	0	2,400,000	0
Specific Allowance
Loans and Financing Receivable
Provision for loan losses	$ 700,000		$ 2,000,000
General Allowance
Loans and Financing Receivable
Provision for loan losses		$ 40,000.00		$ 1,400,000
4
Loans and Financing Receivable
Number Of Loans | Loans	1	5	1	5	3
5
Loans and Financing Receivable
Number Of Loans | Loans	0		0		1

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