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Acquisitions and Divestitures - Additional Information (Detail) - Subsequent Event | Jul. 15, 2016 USD ($) Branch
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Bank of America | Southwestern Virginia |
Business Acquisition [Line Items] |
Number of operating branches | Branch | 7
Deposit held on acquisition date by acquiree | $ 134,000,000
First Bank | Southeastern, Coastal region of North Carolina |
Business Acquisition [Line Items] |
Number of operating branches sold | Branch | 6
Deposit assumed by the buyer | $ 111,000,000
Loan assumed by the buyer | $ 154,000,000

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