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Acquisitions and Divestitures - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 15, 2016 USD ($) Branch | Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition And Disposal [Line Items] |  |  |  |
Merger, acquisition, and divestiture expense |  | $ 226 | $ 675 | $ 86
Net gain on branch divestiture |  | $ 3,065 | $ 3,065 |
Divestiture of Bank Branches to First Bank |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |
Number of operating branches exchanged | Branch | 6 |  |  |
Cash consideration received | $ 24,820 |  |  |
Net gain on branch divestiture | 3,070 |  |  |
Allowance for loan and lease loss, reversed | 1,350 |  |  |
Deposit premium received | $ 4,070 |  |  |
Divestiture of Bank Branches to First Bank | North Carolina |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |
Number of operating branches sold | Branch | 6 |  |  |
Acquisition of Bank Branches from First Bank | Southwestern Virginia |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |
Number of operating branches | Branch | 7 |  |  |
Premium paid | $ 3,840 |  |  |
Bank of America | Southwestern Virginia |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |
Number of operating branches | Branch | 7 |  |  |

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