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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 3,005 $ 4,636  
60-89 Days Past Due 4,809 1,800  
> 90 Days Past Due 3,571 2,148  
Total Past Due 11,385 8,584  
Current 345,708 375,010  
Total Loans 357,093 383,594 392,440
Non-Accrual Loans 11,678 8,393  
90 Days or More Past Due and Accruing 49 228  
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 161 77  
60-89 Days Past Due 2,852 701  
> 90 Days Past Due 3,339 89  
Total Past Due 6,352 867  
Current 27,708 42,657  
Total Loans 34,060 43,524  
Non-Accrual Loans 5,811 646  
90 Days or More Past Due and Accruing        
Secured by 1-4 Family Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,561 2,741  
60-89 Days Past Due 316    
> 90 Days Past Due 136 476  
Total Past Due 2,013 3,217  
Current 139,948 131,747  
Total Loans 141,961 134,964  
Non-Accrual Loans 953 968  
90 Days or More Past Due and Accruing 27 129  
Other Real Estate Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,077 1,347  
60-89 Days Past Due 1,636 686  
> 90 Days Past Due 74 1,476  
Total Past Due 2,787 3,509  
Current 143,181 170,711  
Total Loans 145,968 174,220  
Non-Accrual Loans 4,756 6,752  
90 Days or More Past Due and Accruing        
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 165 428  
60-89 Days Past Due   408  
> 90 Days Past Due 22 99  
Total Past Due 187 935  
Current 22,616 22,136  
Total Loans 22,803 23,071  
Non-Accrual Loans 144 14  
90 Days or More Past Due and Accruing 22 99  
Consumer and Other Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 41 43  
60-89 Days Past Due 5 5  
> 90 Days Past Due   8  
Total Past Due 46 56  
Current 12,255 7,759  
Total Loans 12,301 7,815  
Non-Accrual Loans 14 13  
90 Days or More Past Due and Accruing