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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 8,169
Amortized Cost, Due after one year through five years	17,590
Amortized Cost, Due after five years through ten years	25,230
Amortized Cost, Due after ten years	166,504
Amortized Cost, Mortgage-backed securities	128,343
Amortized Cost, Total securities available for sale	345,836	$ 342,192
Fair Value, Due in one year or less	8,255
Fair Value, Due after one year through five years	18,083
Fair Value, Due after five years through ten years	26,371
Fair Value, Due after ten years	179,051
Fair Value, Mortgage-backed securities	134,126
Fair Value, Total securities available for sale	$ 365,886	$ 358,499

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