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Investments - Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Available-for-sale, Amortized Cost  
Within 1 year $ 238,884
After 1 year through 5 years 178,768
Amortized Cost 417,652
Available-for-sale, Estimated Fair Value  
Within 1 year 239,281
After 1 year through 5 years 179,467
Total 418,748
Held-to-maturity, Amortized Cost  
Within 1 year 3,488
Total 3,488
Held-to-maturity, Estimated Fair Value  
Within 1 year 3,667
Total $ 3,667