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Available-for-Sale Debt Securities - Additional Information (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2020
USD ($)
Apr. 30, 2020
USD ($)
Jun. 30, 2021
Investment
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Investment
Jun. 30, 2020
USD ($)
Mar. 31, 2021
Investment
Schedule Of Available For Sale Securities [Line Items]                
Aggregate losses from the sales       $ 77     $ 1,051  
CMBS and CRE CLO Investments                
Schedule Of Available For Sale Securities [Line Items]                
Number of Investments | Investment               0
Number of investments purchased | Investment     0     0    
CRE CLO Investments                
Schedule Of Available For Sale Securities [Line Items]                
Proceeds from sale of debt securities, gross         $ 151,600      
Impairment of investment         36,200      
CRE Debt Securities                
Schedule Of Available For Sale Securities [Line Items]                
Proceeds from sale of debt securities, gross $ 614,800 $ 766,400            
Impairment of investment         $ 167,300   203,400  
Aggregate face value of debt securities 782,000 $ 969,800            
Payments on secured financing 581,700           $ 824,920  
Proceeds from sale of debt securities, net 33,100              
Aggregate losses from the sales $ 167,300         $ 203,400