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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 10,927
Amortized Cost, Due after one year through five years	16,275
Amortized Cost, Due after five years through ten years	24,424
Amortized Cost, Due after ten years	146,335
Amortized Cost, Mortgage-backed securities	142,860
Amortized Cost, Total securities available for sale	340,821
Fair Value, Due in one year or less	10,877
Fair Value, Due after one year through five years	16,469
Fair Value, Due after five years through ten years	25,631
Fair Value, Due after ten years	152,517
Fair Value, Mortgage-backed securities	144,440
Fair Value, Total securities available for sale	$ 349,934	$ 346,294

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