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Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Sep. 30, 2021 USD ($)
Schedule of Investments [Abstract]
Debt Securities Available for Sale, Amortized Cost, Due in one year or less	$ 694
Debt Securities Available for Sale, Amortized Cost, Due after one year through five years	27,345
Debt Securities Available for Sale, Amortized Cost, Due after five years through ten years	89,716
Debt Securities Available for Sale, Amortized Cost, Due after ten years	244,618
Total	362,373
Debt Securities Available for Sale, Fair Value, Due in one year or less	694
Debt Securities Available for Sale, Fair Value, Due after one year through five years	27,356
Debt Securities Available for Sale, Fair Value, Due after five years through ten years	89,920
Debt Securities Available for Sale, Fair Value, Due after ten years	242,128
Total	$ 360,098

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