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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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