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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 30,183
Due after one year through five years	530,894
Due after five years through ten years	469,554
Due after ten years	29,863
Perpetual maturity securities	698
Amortized Cost	1,061,192	$ 815,647
Fair Value
Due in one year or less	30,163
Due after one year through five years	522,941
Due after five years through ten years	457,010
Due after ten years	29,647
Perpetual maturity securities	694
Fair Value	$ 1,040,455	$ 819,861

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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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