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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) State Branch Segment | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Assets managed by the Company | $ 767,000 |
Assets | $ 2,450,273 | $ 2,462,276
Number of business segment | Segment | 1 |
First Community Bank |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of operating branches | Branch | 45 |
Number of states the company provides services | State | 4 |

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