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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 |

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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 + Details
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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 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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