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Real Estate Securities - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Investment
Jun. 30, 2020
USD ($)
Rating
Investment
Security
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Rating
Investment
Schedule Of Available For Sale Securities [Line Items]        
Carrying value of investments $ 73,903 $ 73,903   $ 157,869
Real estate securities sold   $ 43,928 $ 9,211  
Real Estate Securities        
Schedule Of Available For Sale Securities [Line Items]        
Number of investments | Investment 11 11   17
Carrying value of investments $ 73,903 $ 73,903   $ 157,869
Net unrealized loss   19,113   $ 211
Realized loss 19,288 19,288 43  
Real estate securities sold $ 43,928 $ 43,928 $ 9,211  
Weighted average risk rating | Rating       2
Commercial Mortgage Backed Securities Interest Risk Rating Two        
Schedule Of Available For Sale Securities [Line Items]        
Weighted average risk rating | Rating   2    
Number of commercial mortgage backed securities | Security   3    
Commercial Mortgage Backed Securities Interest Risk Rating Three        
Schedule Of Available For Sale Securities [Line Items]        
Weighted average risk rating | Rating   3    
Number of commercial mortgage backed securities | Security   7    
Commercial Mortgage Backed Securities Internal Risk Rating Four        
Schedule Of Available For Sale Securities [Line Items]        
Weighted average risk rating | Rating   4    
Number of commercial mortgage backed securities | Security   1