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Commercial Mortgage and Subordinate Loans, Net - Narrative (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / ft²	Dec. 31, 2016 USD ($)
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio	100.00%		100.00%
Payment in kind interest	$ 10,600,000	$ 7,900,000
Proceeds from pre-payment penalties or accelerated fees	0	$ 0
Commercial Mortgage and Subordinated Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment	17,000,000
Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment	12,000,000
Terminal capitalization rate				11.00%
Discount rate				10.00%
Subordinate Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment	5,000,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment			$ 2,000,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Fair value inputs, sales price per square foot | $ / ft²			678
Discount rate			15.00%
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment				$ 10,000,000
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses and impairment				$ 5,000,000
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Impairment	$ 3,000,000		$ 3,000,000
Floating Rate Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage of loan portfolio	89.00%		88.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
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-Name Accounting Standards Codification
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-Section 50
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