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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 5,990 $ 4,636  
60-89 Days Past Due 888 1,800  
> 90 Days Past Due 4,718 2,148  
Total Past Due 11,596 8,584  
Current 355,231 375,010  
Total Loans 366,827 383,594 380,752
Non-accrual Loans 8,000 8,393  
90 Days or More Past Due and Accruing 2,150 228  
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,196 77  
60-89 Days Past Due    701  
> 90 Days Past Due 3,374 89  
Total Past Due 4,570 867  
Current 29,834 42,657  
Total Loans 34,404 43,524  
Non-accrual Loans 1,560 646  
90 Days or More Past Due and Accruing 1,834     
Secured by 1-4 Family Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,047 2,741  
60-89 Days Past Due 250     
> 90 Days Past Due 108 476  
Total Past Due 1,405 3,217  
Current 141,041 131,747  
Total Loans 142,446 134,964  
Non-accrual Loans 947 968  
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 3,728 1,347  
60-89 Days Past Due 519 686  
> 90 Days Past Due 1,117 1,476  
Total Past Due 5,364 3,509  
Current 151,327 173,064  
Total Loans 156,691 176,573  
Non-accrual Loans 5,403 6,752  
90 Days or More Past Due and Accruing 277     
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 2 428  
60-89 Days Past Due 119 408  
> 90 Days Past Due 119 99  
Total Past Due 240 935  
Current 21,076 19,783  
Total Loans 21,316 20,718  
Non-accrual Loans 89 14  
90 Days or More Past Due and Accruing 39 99  
Consumer and Other Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 17 43  
60-89 Days Past Due    5  
> 90 Days Past Due   8  
Total Past Due 17 56  
Current 11,953 7,759  
Total Loans 11,970 7,815  
Non-accrual Loans 1 13  
90 Days or More Past Due and Accruing