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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 53,698
Due after one year through five years	504,075
Due after five years through ten years	501,063
Due after ten years	31,710
Perpetual maturity securities	1,892
Amortized Cost	1,092,438	$ 1,061,192
Fair Value
Due in one year or less	53,176
Due after one year through five years	475,424
Due after five years through ten years	455,448
Due after ten years	28,916
Perpetual maturity securities	1,713
Fair Value	$ 1,014,677	$ 1,040,455

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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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