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Allowance for Loan Losses and Credit Quality - Additional information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Minimum commercial loan relationships to be reviewed by loan review function $ 3,000,000  
Total loan restructurings 12,050,000 9,450,000
Net nonaccrual status 3,830,000 3,270,000
Nonperforming TDRs 6,010,000 600,000
Percentage of Total TDR 49.88% 6.35%
Allowance for loan losses 1,870,000 1,140,000
Interest income recognized on loan restructurings 736,000 561,000
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000  
Performing status returned period 6 months  
Payment defaults on loans modified as TDRs 0  
Time period for restructuring 12 months  
Special Mention
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 2,420,000  
Substandard
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 1,410,000  
Doubtful
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 1,610,000  
Loss
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 42,000  
Waccamaw and Peoples | Special Mention
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 12,690,000  
Waccamaw and Peoples | Substandard
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease 29,820,000  
Waccamaw and Peoples | Doubtful
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loan increase decrease $ 1,370,000