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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 11,232
Amortized Cost, Due after one year through five years	14,540
Amortized Cost, Due after five years through ten years	25,421
Amortized Cost, Due after ten years	174,967
Amortized Cost, Mortgage-backed securities	114,113
Amortized Cost, Total securities available for sale	340,273	$ 342,192
Fair Value, Due in one year or less	11,311
Fair Value, Due after one year through five years	14,913
Fair Value, Due after five years through ten years	27,602
Fair Value, Due after ten years	191,658
Fair Value, Mortgage-backed securities	120,390
Fair Value, Total securities available for sale	$ 365,874	$ 358,499

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