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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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