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Business Combinations (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Waccamaw Bank [Member]
Jun. 30, 2012
Waccamaw Bank [Member]
Jun. 30, 2012
Waccamaw Bank [Member]
Sep. 30, 2012
Waccamaw Bank [Member]
Property
Number
Jun. 08, 2012
Waccamaw Bank [Member]
Property
Sep. 30, 2012
Peoples Bank of Virginia [Member]
Sep. 30, 2012
Peoples Bank of Virginia [Member]
May 31, 2012
Peoples Bank of Virginia [Member]
Business Combinations (Textual) [Abstract]                            
Assets held on acquisition date by acquiree                           $ 276,880,000
Loans                           184,840,000
Deposit held on acquisition date by acquiree                           232,750,000
Common equity                           43,380,000
Cash received                         $ 6.08  
Common Stock                       $ 1.07 $ 1.07  
Purchase Price common stock 40,277,000     40,277,000               40,280,000 40,280,000  
Common Stock valued 26,469,000     26,469,000               26,470,000 26,470,000  
Total cash consideration of common stock 12,259,000     12,259,000               12,260,000 12,260,000  
Common stock issued                         2,157,005  
Market price of common stock                           $ 12.27
Additions to goodwill             11,660,000     11,660,000   9,100,000 9,100,000  
Estimated fair value useful life                   P1Y        
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 in connection with the acquisition. 49,477,000     49,477,000      17,270,000     17,270,000 49,755,000      
Goodwill was recorded as part of the acquisition of Waccamaw             11,660,000     11,660,000   9,100,000 9,100,000  
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        
Noninterest income included pre-tax gain       9,103,000       0 0          
Expenses incurred related to acquisition                       163,000 3,150,000  
Recognized in merger-related expense from Waccamaw acquisition 645,000      4,227,000      482,000     1,080,000        
Business acquisition number of properties purchase                     2      
Number of properties purchase under purchase option                   0        
Business Combinations (Additional Textual) [Abstract]                            
Additions to core deposits intangibles 0     0                    
Share agreement estimated payment to FDIC       0                    
Loss sharing agreement true up estimated eliminated term excess of current estimated over actual loss     $ 0                      
Period of Option to acquire property       30 days