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Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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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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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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