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Subsequent Events - Additional Information (Detail) | Mar. 04, 2016 USD ($) Branch | Oct. 24, 2014 USD ($) Branch
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Bank of America |  |
Subsequent Event [Line Items] |  |
Number of operating branches | Branch |  | 7
Deposit held on acquisition date by acquiree | $ |  | $ 318,880,000
Bank of America | Southwestern Virginia |  |
Subsequent Event [Line Items] |  |
Number of operating branches | Branch |  | 6
Subsequent Event | Bank of America | Southwestern Virginia |  |
Subsequent Event [Line Items] |  |
Number of operating branches | Branch | 7 |
Deposit held on acquisition date by acquiree | $ | $ 150,000,000 |
Subsequent Event | First Bank | Southeastern, Coastal region of North Carolina |  |
Subsequent Event [Line Items] |  |
Number of operating branches sold | Branch | 6 |
Deposit assumed by the buyer | $ | $ 130,000,000 |
Subsequent Event | First Bank | Southeastern, Coastal region of North Carolina | Maximum |  |
Subsequent Event [Line Items] |  |
Loan assumed by the buyer | $ | $ 175,000,000 |

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