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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Concentration of Risk    
Aggregate unpaid principal balance of loans secured by properties $ 388,422 $ 310,191
Mortgage loans | Geographic concentration | California    
Concentration of Risk    
Percentage of risk 84.70%  
Properties kept as security for long-term mortgage portfolio | Geographic concentration | California    
Concentration of Risk    
Aggregate unpaid principal balance of loans secured by properties $ 2,600,000  
Percentage of risk 52.00%  
Properties kept as security for long-term mortgage portfolio | Geographic concentration | Florida    
Concentration of Risk    
Aggregate unpaid principal balance of loans secured by properties $ 517,000  
Percentage of risk 10.00%