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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 31,333
Due after one year through five years	480,269
Due after five years through ten years	270,152
Due after ten years	33,728
Perpetual maturity securities	165
Amortized Cost	815,647	$ 828,336
Fair Value
Due in one year or less	31,578
Due after one year through five years	482,031
Due after five years through ten years	272,445
Due after ten years	33,596
Perpetual maturity securities	211
Fair Value	$ 819,861	$ 855,284

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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