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Acquisitions and Divestitures - Additional Information (Detail)
 12 Months Ended
Oct. 01, 2016
USD ($)
Branch
Jul. 15, 2016
USD ($)
Branch
Oct. 31, 2015
USD ($)
Business
Dec. 12, 2014
USD ($)
Oct. 24, 2014
USD ($)
Branch
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition And Disposal [Line Items]                  
Proceeds from sale of business           $ 58,226,000 $ (231,000) $ (131,230,000)  
Net gain on branch divestiture           3,682,000   755,000  
Business combination, acquisition related costs           684,000      
Allocation of goodwill           95,779,000 100,486,000 $ 100,722,000 $ 105,455,000
Insurance Services                  
Business Acquisition And Disposal [Line Items]                  
Proceeds from sale of business     $ 372,000            
Net gain on branch divestiture     (8,000)            
Goodwill and other intangible assets write down     $ 385,000            
Number of insurance agencies sold | Business     1            
Earn-out payments related to acquisitions             $ 88,000    
CresCom Bank                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold       13          
Net gain on branch divestiture       $ 755,000          
Loan divested by the buyer       70,040,000          
Deposit premium received       6,450,000          
Deposit divested by the buyer       215,190,000          
Allocation of goodwill       $ 6,450,000          
CresCom Bank | Southeastern, Coastal region of North Carolina                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold       10          
CresCom Bank | South Carolina                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold       3          
Divestiture of Bank Branches to First Bank                  
Business Acquisition And Disposal [Line Items]                  
Net gain on branch divestiture   $ 3,070,000              
Assets divested   162,170,000              
Loan divested by the buyer   155,540,000              
Goodwill and other intangible assets divested   2,330,000              
Liabilities divested   111,050,000              
Deposits divested   111,020,000              
Deposit premium received   $ 4,070,000              
Divestiture of Bank Branches to First Bank | Southeastern, Coastal region of North Carolina                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold | Branch   6              
Greenpoint Insurance Group                  
Business Acquisition And Disposal [Line Items]                  
Proceeds from sale of business $ 7,110,000                
Sale of business, earn-out payments to be received $ 2,210,000                
Sale of business, earn-out payments, term 3 years                
Net gain on branch divestiture           617,000      
Goodwill and other intangible assets write down           6,490,000      
Expenses related to divestiture of business           $ 46,000      
Greenpoint Insurance Group | Southeastern, Coastal region of North Carolina                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold | Branch 2                
Carr and Hyde Insurance | Virginia                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches sold | Branch 2                
Bank of America                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches | Branch         7        
Deposit held on acquisition date by acquiree         $ 318,880,000        
Premium on deposits acquired         5,790,000        
Loans recognized         $ 0        
Bank of America | Southwestern Virginia                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches | Branch   7     6        
Bank of America | Central North Carolina                  
Business Acquisition And Disposal [Line Items]                  
Number of operating branches | Branch         1        
Acquisition of Bank Branches from First Bank                  
Business Acquisition And Disposal [Line Items]                  
Assets acquired   $ 160,690,000              
Loans acquired   149,120,000              
Goodwill and other intangible assets acquired   6,290,000              
Liabilities acquired   134,380,000              
Deposits acquired   134,310,000              
Premium paid   $ 3,840,000