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Loans Held for Investment - Summary of the Companys loan portfolio (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
Carrying Value	480,462,652	422,280,515
Fair Value	$ 478,397,706	$ 419,407,194
Weighted-average coupon rate	8.50%	8.51%
Weighted-average remaining term (years)	1 year 1 month 20 days	1 year 5 months 23 days
Fixed Rate
Loans and Financing Receivable
Number Of Loans | Loans	5	6
Principal Balance	$ 92,808,312	$ 56,335,792
Carrying Value	93,656,356	56,464,310
Fair Value	$ 93,571,526	$ 56,284,334
Weighted-average coupon rate	12.94%	12.17%
Weighted-average remaining term (years)	1 year 2 months 23 days	1 year 9 months 10 days
Floating rate
Loans and Financing Receivable
Number Of Loans | Loans	14	14
Principal Balance	$ 389,281,253	$ 367,838,966
Carrying Value	386,806,296	365,816,205
Fair Value	$ 384,826,180	$ 363,122,860
Weighted-average coupon rate	7.44%	7.95%
Weighted-average remaining term (years)	1 year 1 month 13 days	1 year 5 months 8 days

X

- Definition

Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
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-Section 12
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section S99
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 4
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