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Securities - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Securities | Dec. 31, 2016 USD ($) Securities | Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities holdings | Securities | 0 | 0 |
Shareholders' equity percentage | 10.00% | 10.00% |
Securities | $ 319,575 | $ 329,379 |
Tax provision related to net realized gains | 540 | 352 | $ 233
Proceeds from sale of trading securities | 1,091 | 540 | 2,129
Net realized (losses) gains on trading securities | 93 | 70 | $ (211)
Pooled Trust Preferred [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Pooled trust preferred securities sold | 800 | 0 |
Net realized (losses) gains on trading securities | $ 1,383 | $ 922 |

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