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Acquisitions and Divestitures - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 31, 2012
Peoples Bank of Virginia
Branch
Dec. 31, 2012
Waccamaw Bank
Branch
Dec. 31, 2013
Waccamaw Bank
Jun. 08, 2012
Waccamaw Bank
Dec. 31, 2013
Insurance Services
Entity
Dec. 31, 2012
Insurance Services
Dec. 31, 2011
Insurance Services
Dec. 31, 2013
Greenpoint
Dec. 31, 2012
Greenpoint
Dec. 31, 2011
Greenpoint
Entity
Business Acquisition [Line Items]                            
Number of operating branches         4 16                
Assets held on acquisition date by acquiree         $ 275,760,000     $ 500,640,000            
Loans         184,840,000     318,350,000            
Deposit held on acquisition date by acquiree         232,750,000     414,130,000            
Cash consideration         40,280,000       150,000     944,000 58,239,000 680,000
Common stock valued         26,470,000                  
Total cash consideration of common stock         12,260,000                  
Common stock issued         2,157,005                  
Market price of common stock         $ 12.27                  
Cash received         $ 6.08                  
Common stock         $ 1.07                  
Additions to goodwill 105,455,000 104,866,000 83,056,000 84,914,000 10,320,000     10,620,000            
FDIC loan and foreclosed real estate losses           80.00% 80.00%              
Indemnification asset recorded at acquisition               49,760,000            
Number of insurance agencies acquired                 1          
Additional cash consideration                 253,000          
Goodwill and intangible asset added from acquisition                 324,000          
Cash received from sale of insurance agencies                           1,575,000
Number of insurance agencies sold                           2
Earn-out payments related to acquisitions                 $ 442,000 $ 692,000 $ 680,000