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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 5,115 $ 4,636  
60-89 Days Past Due 1,887 1,800  
> 90 Days Past Due 4,788 2,148  
Total Past Due 11,790 8,584  
Current 365,723 375,010  
Total Loans 377,513 383,594 384,135
Non-accrual Loans 9,092 8,393  
90 Days or More Past Due and Accruing 1,889 228  
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,873 77  
60-89 Days Past Due   701  
> 90 Days Past Due 4,546 89  
Total Past Due 6,419 867  
Current 37,886 42,657  
Total Loans 44,305 43,524  
Non-accrual Loans 2,678 646  
90 Days or More Past Due and Accruing 1,889    
Secured by 1-4 Family Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,731 2,741  
60-89 Days Past Due 445    
> 90 Days Past Due 89 476  
Total Past Due 2,265 3,217  
Current 143,363 131,747  
Total Loans 145,628 134,964  
Non-accrual Loans 1,577 968  
90 Days or More Past Due and Accruing   129  
Other Real Estate Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,173 1,347  
60-89 Days Past Due 1,415 686  
> 90 Days Past Due 74 1,476  
Total Past Due 2,662 3,509  
Current 157,172 173,064  
Total Loans 159,834 176,573  
Non-accrual Loans 4,745 6,752  
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 261 428  
60-89 Days Past Due 24 408  
> 90 Days Past Due 79 99  
Total Past Due 364 935  
Current 19,337 19,783  
Total Loans 19,701 20,718  
Non-accrual Loans 90 14  
90 Days or More Past Due and Accruing   99  
Consumer and Other Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 77 43  
60-89 Days Past Due 3 5  
> 90 Days Past Due   8  
Total Past Due 80 56  
Current 7,965 7,759  
Total Loans 8,045 7,815  
Non-accrual Loans $ 2 $ 13