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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 10,142
Amortized Cost, Due after one year through five years	16,274
Amortized Cost, Due after five years through ten years	21,766
Amortized Cost, Due after ten years	153,306
Amortized Cost, Mortgage-backed securities	134,664
Amortized Cost, Total securities available for sale	336,152	$ 343,323
Fair Value, Due in one year or less	10,134
Fair Value, Due after one year through five years	16,558
Fair Value, Due after five years through ten years	23,229
Fair Value, Due after ten years	166,071
Fair Value, Mortgage-backed securities	139,295
Fair Value, Total securities available for sale	$ 355,287	$ 346,294

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