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Securities Loaned (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument    
Securities loaned $ 0 $ 33,278,000
Cantor    
Debt Instrument    
Securities loaned $ 0 33,300,000
Securities loaned, fair value   $ 32,600,000
Stated interest rate (in percentage)   0.85%