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Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Number of business segments | Segment										1
Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 0				$ 62,457,000					$ 0	$ 62,457,000
Origination and exit fees received on commercial mortgage loans and subordinate loans										27,904,000	12,500,000	$ 17,939,000
Provision for loan losses and impairment	0	$ 0	$ 5,000,000	$ 0	0	$ 0	$ 15,000,000	$ 0		5,000,000	15,000,000	0
Capitalized financing costs	14,348,000				6,763,000					14,348,000	6,763,000
Commercial Mortgage and Subordinated Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses and impairment									$ 1,981,000	1,981,000
Loan receivable, allowance	$ 16,981,000				$ 15,000,000					16,981,000	15,000,000
Commercial Mortgage Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses and impairment										11,981,000	10,000,000
Loan receivable, allowance												$ 0
Subordinate Mortgage Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses and impairment										5,000,000	$ 5,000,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Provision for loan losses and impairment										1,981,000
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment									$ 3,019,000
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member]
Summary Of Significant Accounting Policies [Line Items]
Impairment										$ 3,019,000

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Mortgage Loans on Real Estate, Impairment

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.

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