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General - Additional Information (Detail)
 6 Months Ended
Dec. 12, 2014
USD ($)
Branch
Oct. 24, 2014
USD ($)
Branch
Jun. 30, 2015
USD ($)
State
Segment
Location
shares
Dec. 31, 2014
USD ($)
shares
Jun. 30, 2014
shares
Summary Of Significant Accounting Policies [Line Items]          
Number of business segment | Segment     1    
Number of locations operated | Location     62    
Number of states operated | State     4    
Allocation of goodwill     $ 100,810,000 $ 100,722,000  
Each share convertible into shares | shares     69    
Redemption of preferred stock, shares | shares     2,367    
Redemption of preferred stock     $ 2,367,000    
Series A Preferred Stock          
Summary Of Significant Accounting Policies [Line Items]          
Dividend Rate     6.00%    
Number of preferred stock converted | shares     12,784    
Redemption of preferred stock, shares | shares     2,367    
Redemption of preferred stock     $ 2,370,000    
Accrued and unpaid dividends     $ 9,000    
Number of Series A Noncumulative Preferred Stock Shares | shares     0 15,151 15,151
Bank of America          
Summary Of Significant Accounting Policies [Line Items]          
Allocation of goodwill   $ 1,370,000      
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          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches | Branch   6      
Bank of America | Central North Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches | Branch   1      
CresCom Bank          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold | Branch 13        
Deposit assumed by the buyer $ 215,190,000        
Loan assumed by the buyer 70,040,000        
Net gain on branch divestiture 755,000        
Deposit premium received 6,450,000        
Allocation of goodwill $ 6,450,000        
CresCom Bank | Southeastern, Coastal region of North Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold | Branch 10        
CresCom Bank | South Carolina          
Summary Of Significant Accounting Policies [Line Items]          
Number of operating branches sold | Branch 3