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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%