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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 31,202
Due after one year through five years	609,963
Due after five years through ten years	370,677
Due after ten years	26,301
Perpetual maturity securities	899
Amortized Cost	1,039,042	$ 815,647
Fair Value
Due in one year or less	31,275
Due after one year through five years	606,996
Due after five years through ten years	363,943
Due after ten years	26,046
Perpetual maturity securities	897
Fair Value	$ 1,029,157	$ 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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