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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