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Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Mar. 31, 2022 USD ($)
Schedule of Investments [Abstract]
Debt Securities Available for Sale, Amortized Cost, Due in one year or less	$ 9,412
Debt Securities Available for Sale, Amortized Cost, Due after one year through five years	36,249
Debt Securities Available for Sale, Amortized Cost, Due after five years through ten years	133,649
Debt Securities Available for Sale, Amortized Cost, Due after ten years	223,896
Total	403,206
Debt Securities Available for Sale, Fair Value, Due in one year or less	9,320
Debt Securities Available for Sale, Fair Value, Due after one year through five years	34,710
Debt Securities Available for Sale, Fair Value, Due after five years through ten years	126,631
Debt Securities Available for Sale, Fair Value, Due after ten years	204,823
Total	$ 375,484

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