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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 15,294
Amortized Cost, Due after one year through five years	16,910
Amortized Cost, Due after five years through ten years	30,844
Amortized Cost, Due after ten years	119,306
Amortized Cost, Mortgage-backed securities	135,764
Amortized Cost	318,118	$ 226,550
Fair value, Due in one year or less	15,226
Fair value, Due after one year through five years	16,856
Fair value, Due after five years through ten years	31,729
Fair value, Due after ten years	119,034
Fair value, Mortgage-backed securities	134,121
Fair value, Total securities available for sale	$ 316,966	$ 230,230

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