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

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