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Credit Quality - Additional information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Minimum commercial loan relationships to be reviewed by loan review function $ 3,000,000    
Restructured loans to borrowers experiencing financial difficulty in excess of 250,000    
Performing status returned period 6 months    
Allowance for loan losses 1,830,000   1,840,000
Interest income recognized on loan restructurings 149,000 240,000  
Covered Loans
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Accruing loans contractually past due 90 days or more 109,000   86,000
PCI loans
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Number of impaired loans 3   4
Number of loans 7    
Waccamaw Bank
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Percentage of loan and foreclosed real estate losses covered by FDIC 80.00%    
Amount of covered loans decreased $ 2,750,000    
Percentage of covered loans decreased 6.63%