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Investment Securities and Other Investments - Summary of Investments Classified by Contractual Maturity Date (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Schedule Of Investments [Abstract]
Securities Available for Sale, Amortized Cost, Due after one year through five years	$ 2,500
Securities Available for Sale, Amortized Cost, Due after five years	18,670
Securities Available for Sale, Amortized Cost, Due after ten years	86,867
Securities Available for Sale, Amortized Cost, Total	108,037
Securities Available for Sale, Fair Value, Due after one year through five years	2,508
Securities Available for Sale, Fair Value, Due after five years	18,659
Securities Available for Sale, Fair Value, Due after ten years	87,404
Securities Available for Sale, Fair Value, Total	108,571
Securities Held to Maturity, Amortized Cost, Due in one year or less	460
Securities Held to Maturity, Amortized Cost, Due after one year through five years	2,584
Securities Held to Maturity, Amortized Cost, Due after five years	3,764
Securities Held to Maturity, Amortized Cost, Due after ten years	5,384
Securities Held to Maturity, Amortized Cost, Total	12,192
Securities Held to Maturity, Fair Value, Due in one year or less	460
Securities Held to Maturity, Fair Value, Due after one year through five years	2,628
Securities Held to Maturity, Fair Value, Due after five years	3,913
Securities Held to Maturity, Fair Value, Due after ten years	5,653
Securities Held to Maturity, Fair Value, Total	$ 12,654

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