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Loans and Investments, Non-performing Loans (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Non-performing loans by asset class
Number of loans | loan	149	144
Carrying Value	$ 0	$ 0
Non-performing loans
Non-performing loans by asset class
Number of loans | loan	5	3
Carrying value of loans	$ 32,600,000	$ 22,900,000
Loan loss reserves	27,900,000
Carrying Value	60,514,639	22,853,097
Greater Than 90 Days Past Due
Non-performing loans by asset class
Past Due, Non-performing Loans	0	0
Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	60,514,639	22,853,097
Hotel | Non-performing loans
Non-performing loans by asset class
Carrying Value	34,750,000
Hotel | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	34,750,000
Office | Non-performing loans
Non-performing loans by asset class
Carrying Value	20,472,444	20,472,444
Office | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	20,472,444	20,472,444
Multifamily | Non-performing loans
Non-performing loans by asset class
Carrying Value	2,601,528	680,653
Multifamily | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	2,601,528	680,653
Commercial | Non-performing loans
Non-performing loans by asset class
Carrying Value	1,700,000	1,700,000
Commercial | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	1,700,000	$ 1,700,000
Retail | Non-performing loans
Non-performing loans by asset class
Carrying Value	990,667
Retail | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	$ 990,667

X

- Definition

Reflects the amount of reserves on loans on which no interest is continuing to be recognized.

+ References

No definition available.

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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- Definition

The carrying amount of the outstanding balance due under the mortgage loan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.3)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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