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Investment Securities - Summary of investments classified by contractual maturity date (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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 | 8,794 |
Securities Available for Sale, Amortized Cost, Due after ten years | 108,854 |
Securities Available for Sale, Amortized Cost, Total | 120,148 | $ 38,828
Securities Available for Sale, Fair Value, Due after one year through five years | 2,499 |
Securities Available for Sale, Fair Value, Due after five years | 8,781 |
Securities Available for Sale, Fair Value, Due after ten years | 110,460 |
Securities Available for Sale, Fair Value, Total | 121,740 | 38,047
Securities Held to Maturity, Amortized Cost, Due in one year or less | 461 |
Securities Held to Maturity, Amortized Cost, Due after one year through five years | 2,590 |
Securities Held to Maturity, Amortized Cost, Due after five years | 3,761 |
Securities Held to Maturity, Amortized Cost, Due after ten years | 6,305 |
Securities Held to Maturity, Amortized Cost, Total | 13,117 | 15,565
Securities Held to Maturity, Fair Value, Due in one year or less | 463 |
Securities Held to Maturity, Fair Value, Due after one year through five years | 2,641 |
Securities Held to Maturity, Fair Value, Due after five years | 3,863 |
Securities Held to Maturity, Fair Value, Due after ten years | 6,648 |
Securities Held to Maturity, Fair Value, Total | $ 13,615 | $ 15,503

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