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Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Mar. 31, 2021 USD ($)
Schedule Of Investments [Abstract]
Debt Securities Available for Sale, Amortized Cost, Due in one year or less	$ 20,100
Debt Securities Available for Sale, Amortized Cost, Due after one year through five years	52,994
Debt Securities Available for Sale, Amortized Cost, Due after five years through ten years	41,606
Debt Securities Available for Sale, Amortized Cost, Due after ten years	166,362
Total	281,062
Debt Securities Available for Sale, Fair Value, Due in one year or less	19,986
Debt Securities Available for Sale, Fair Value, Due after one year through five years	53,082
Debt Securities Available for Sale, Fair Value, Due after five years through ten years	41,811
Debt Securities Available for Sale, Fair Value, Due after ten years	163,855
Total	$ 278,734

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