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Business Combinations and Branching Activity - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Peoples Bank of Virginia
May 31, 2012
Peoples Bank of Virginia
Dec. 31, 2011
Peoples Bank of Virginia
Proforma Adjustment
Dec. 31, 2012
Waccamaw Bank
Property
Dec. 31, 2012
Greenpoint
Entity
Dec. 31, 2011
Greenpoint
Dec. 31, 2010
Greenpoint
Dec. 31, 2009
Greenpoint
Dec. 31, 2012
Greenpoint
Prior to 2012
Dec. 31, 2011
Greenpoint
Prior to 2012
Dec. 31, 2010
Greenpoint
Prior to 2012
Business Acquisition [Line Items]                            
Assets held on acquisition date by acquiree         $ 275,760,000                  
Loans         184,840,000                  
Deposit held on acquisition date by acquiree         232,750,000                  
Common equity         42,270,000                  
Cash received       $ 6.08                    
Common Stock       $ 1.07                    
Purchase Price common stock 40,277,000     40,280,000       (58,239,000) (680,000) (1,650,000)        
Common Stock valued 26,469,000     26,470,000                    
Cash consideration 12,259,000     12,260,000           190,000 1,310,000      
Common stock issued       2,157,005                    
Market price of common stock       $ 12.27                    
Additions to goodwill       10,210,000     10,900,000              
Estimated fair value useful life       1 year                    
Net income           1,320,000                
Interest income           1,490,000                
Interest expense           (547,000)                
Income tax expense           713,000                
Recognized in merger-related expense 5,093,000     3,330,000     1,760,000              
Number of operating branches of waccamaw bank             16              
Discount received by bank on asset acquired             15,000,000              
FDIC loan and foreclosed real estate losses             80.00%              
FDIC loss sharing and bank reimbursements             10 years              
FDIC loss sharing for commercial assets period             5 years              
Bank reimbursement period on commercial assets to FDIC             8 years              
Cash received from sale of insurance agencies               366,000 1,575,000          
Number of insurance agencies acquired               7            
Number of insurance agencies sold               3            
Goodwill and intangible asset added from acquisition               9,820,000       692,000 680,000 1,170,000
Amortization of intangible assets $ 804,000 $ 1,020,000 $ 1,032,000         $ 1,960,000