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Other Assets and Liabilities - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
property
Jun. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
loan
property
Other Assets and Other Liabilities [Line Items]      
Real estate owned (REO) $ 4,645 $ 4,645 $ 5,533
Amount related to transfers into REO   2,000  
REO liquidations   (3,000)  
Unrealized gain resulting from market valuation adjustments on REO   $ 300  
Sequoia      
Other Assets and Other Liabilities [Line Items]      
Number of REO properties recorded on balance sheet (in properties) | property 18 18 23
Commercial Loans at Lower of Cost or Market      
Other Assets and Other Liabilities [Line Items]      
Number of loans measured at lower of cost or market (in loans) | loan     1
Principal balance     $ 3,000
Loans, at lower of cost or fair value     3,000
Gain on early repayment of loans receivable $ 300    
Commercial loans, yield maintenance fee revenue $ 200    
Commercial Loans at Lower of Cost or Market | Fair Value      
Other Assets and Other Liabilities [Line Items]      
Loans, at lower of cost or fair value     $ 3,000