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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
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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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