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Subsequent Events - Narrative (Details) - U.S Treasury Securities - USD ($)
$ in Thousands
1 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Feb. 28, 2021
Jan. 31, 2021
Subsequent Event [Line Items]        
U.S. Treasury securities, purchased   $ 82,393 $ 31,999 $ 21,999
Subsequent Event        
Subsequent Event [Line Items]        
U.S. Treasury securities, purchased $ 49,998      
Debt instrument, maturity date Jul. 31, 2021