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Investment Securities - Summary of investments classified by contractual maturity date (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
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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