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Loans and Investments, Non-performing Loans (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Sep. 30, 2017 USD ($)
Non-performing loans by asset class
Number of loans | loan	191	170
Carrying Value	$ 0	$ 0
Non-performing loans
Non-performing loans by asset class
Number of loans | loan	2
Carrying value of loans	$ 800	29,100
Loan loss reserves	1,700	7,400
Carrying Value	2,531	36,450
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	2,531	36,450
Commercial | Non-performing loans
Non-performing loans by asset class
Carrying Value	1,700	1,700
Commercial | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	1,700	1,700
Hotel
Non-performing loans by asset class
Impaired Financing Receivable, Unpaid Principal Balance	34,800
Hotel | Non-performing loans
Non-performing loans by asset class
Carrying Value		34,750	$ 34,800
Hotel | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans		$ 34,750
Office | Non-performing loans
Non-performing loans by asset class
Carrying Value	831
Office | Greater Than 90 Days Past Due | Non-performing loans
Non-performing loans by asset class
Past Due, Non-performing Loans	$ 831

X

- Definition

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)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Recorded Investment in financing receivables that are past due at the balance sheet date.

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-SubTopic 10
-Section 50
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-SubTopic 10
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-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Amount 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, written down.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 310
-Section S99
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