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Investment Securities and Other Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Schedule Of Investments [Abstract]
Securities Available for Sale, Amortized Cost, Due in one year or less	$ 3,427
Securities Available for Sale, Amortized Cost, Due after one year through five years	6,305
Securities Available for Sale, Amortized Cost, Due after five years through ten years	32,003
Securities Available for Sale, Amortized Cost, Due after ten years	66,926
Securities Available for Sale, Amortized Cost, Total	108,661
Securities Available for Sale, Fair Value, Due in one year or less	930
Securities Available for Sale, Fair Value, Due after one year through five years	6,963
Securities Available for Sale, Fair Value, Due after five years through ten years	34,057
Securities Available for Sale, Fair Value, Due after ten years	67,525
Securities Available for Sale, Fair Value, Total	$ 109,475

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