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Investment Securities and Certificates of Deposit - Scheduled Maturities of Available-for-Sale Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Due within one year, amortized cost $ 147,995 $ 402,824
Debt Securities, Available-for-sale, Amortized Cost 147,995 402,824
Due within one year, fair value 147,996 402,863
Total, fair value $ 147,996 $ 402,863