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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 10,871
Amortized Cost, Due after one year through five years	16,215
Amortized Cost, Due after five years through ten years	21,705
Amortized Cost, Due after ten years	153,484
Amortized Cost, Mortgage-backed securities	141,788
Amortized Cost, Total securities available for sale	344,063
Fair Value, Due in one year or less	10,851
Fair Value, Due after one year through five years	16,516
Fair Value, Due after five years through ten years	23,070
Fair Value, Due after ten years	163,276
Fair Value, Mortgage-backed securities	145,760
Fair Value, Total securities available for sale	$ 359,473	$ 346,294

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