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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investments Debt And Equity Securities [Abstract] |  |
Amortized Cost, Due in one year or less | $ 10,963 |
Amortized Cost, Due from one to five years | 19,087 |
Amortized Cost, Due from five to ten years | 29,384 |
Amortized Cost, Due after ten years | 140,182 |
Amortized Cost, Mortgage-backed securities in government sponsored entities | 143,707 |
Amortized Cost | 343,323 |
Fair Value, Due in one year or less | 10,912 |
Fair Value, Due from one to five years | 19,147 |
Fair Value, Due from five to ten years | 30,523 |
Fair Value, Due after ten years | 142,174 |
Fair Value, Mortgage-backed securities in government sponsored entities | 143,538 |
Fair Value, Total securities available for sale | $ 346,294 | $ 230,230

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