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Other Assets and Liabilities - Additional Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
property
loan
Dec. 31, 2016
USD ($)
property
Other Assets and Other Liabilities [Line Items]    
Real estate owned (REO) $ 3,953 $ 5,533
Amount related to transfers into REO 1,000  
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 17 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  
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