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Investments in Debt Securities - Summary of Debt Securities by Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis [Abstract]    
Within one year $ 174,674  
After one year through five years 20,297  
Total $ 194,971 $ 62,327