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Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Schedule of Investments [Abstract]
Debt Securities Available for Sale, Amortized Cost, Due in one year or less	$ 9,545
Debt Securities Available for Sale, Amortized Cost, Due after one year through five years	43,330
Debt Securities Available for Sale, Amortized Cost, Due after five years through ten years	138,816
Debt Securities Available for Sale, Amortized Cost, Due after ten years	230,867
Total	422,558
Debt Securities Available for Sale, Fair Value, Due in one year or less	9,477
Debt Securities Available for Sale, Fair Value, Due after one year through five years	38,851
Debt Securities Available for Sale, Fair Value, Due after five years through ten years	120,774
Debt Securities Available for Sale, Fair Value, Due after ten years	190,414
Total	$ 359,516

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