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Investment Securities - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Jun. 30, 2020 USD ($)
Schedule Of Investments [Abstract]
Securities Available for Sale, Amortized Cost, Due in one year or less	$ 595
Securities Available for Sale, Amortized Cost, Due after one year through five years	4,629
Securities Available for Sale, Amortized Cost, Due after five years through ten years	24,492
Securities Available for Sale, Amortized Cost, Due after ten years	74,901
Securities Available for Sale, Amortized Cost, Total	104,617
Securities Available for Sale, Fair Value, Due in one year or less	596
Securities Available for Sale, Fair Value, Due after one year through five years	4,551
Securities Available for Sale, Fair Value, Due after five years through ten years	23,448
Securities Available for Sale, Fair Value, Due after ten years	75,886
Securities Available for Sale, Fair Value, Total	$ 104,481

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