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Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Jun. 30, 2021 USD ($)
Schedule Of Investments [Abstract]
Debt Securities Available for Sale, Amortized Cost, Due in one year or less	$ 6,351
Debt Securities Available for Sale, Amortized Cost, Due after one year through five years	24,786
Debt Securities Available for Sale, Amortized Cost, Due after five years through ten years	57,224
Debt Securities Available for Sale, Amortized Cost, Due after ten years	174,320
Total	262,681
Debt Securities Available for Sale, Fair Value, Due in one year or less	6,352
Debt Securities Available for Sale, Fair Value, Due after one year through five years	24,850
Debt Securities Available for Sale, Fair Value, Due after five years through ten years	57,585
Debt Securities Available for Sale, Fair Value, Due after ten years	172,523
Total	$ 261,309

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