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Merger - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 06, 2015 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Business Combinations [Line Items] |  |  |  |
Goodwill |  |  | $ 27,095 | $ 27,095
Merger related costs |  | $ 391 |  |
TCNB Financial Corp [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Cash paid for acquisition | $ 17,226 |  |  |
Acquisition value per share | $ 23.50 |  |  |
Total assets of TCNB prior to the merger | $ 97,479 |  |  |
Assets, loan | 76,771 |  |  |
Assets, Deposit | 86,708 |  |  |
Goodwill | 5,375 |  |  |
Cash and short-term investments acquired | 18,152 |  |  |
Loans acquired | 76,444 |  |  |
Loans acquired with credit deterioration | 831 |  |  |
Deposits acquired | $ 86,900 |  |  |
Minimum [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Core deposit intangibles and other intangibles, amortization period | 5 years |  |  |
Maximum [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Core deposit intangibles and other intangibles, amortization period | 10 years |  |  |

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