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Commercial Mortgage and Subordinate Loans, Net - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Mar. 31, 2018 | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / ft² | Dec. 31, 2016 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  | 100.00% |  | 100.00% |
Provision for loan losses and impairment | $ 5,000,000 |  | $ 5,000,000 | $ 5,000,000 | $ 5,000,000 |  |
Interest rate |  |  |  | 8.10% |  | 8.40% |
Payment in kind interest | 9,100,000 |  | 6,100,000 | $ 19,700,000 | 14,000,000 |  |
Proceeds from pre-payment penalties or accelerated fees | 1,600,000 |  | 600,000 | 1,600,000.0 | $ 600,000.0 |  |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  | 5,000,000 |  |  |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  | 17,000,000 |  | $ 12,000,000 |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [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] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan loss provision and impairment |  |  |  | 10,000,000 |  |  |
Provision for loan losses and impairment | $ 5,000,000 |  | 2,000,000 |  |  |  |
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  | $ 10,000,000
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  | $ 5,000,000
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Impairment |  |  | $ 3,000,000 | $ 3,000,000 |  |  |
Floating Rate Loan [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  | 91.00% |  | 88.00% |
Dollars per square foot [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral, measurement input | $ / ft² |  |  |  |  |  | 662 |
Discount rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  | 0.10
Discount rate [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  | 0.15 |
Terminal capitalization rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  | 0.11
Contractual Interest Rate Reduction [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Number of loans restructured | loan | 1 |  |  |  |  |  |
Unpaid principal balance of loan restructured | $ 169,000,000 |  |  | $ 169,000,000 |  |  |
Contractual Interest Rate Reduction [Member] | London Interbank Offered Rate (LIBOR) [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |
Interest rate | 3.00% | 5.50% |  |  |  |  |

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