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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, 2014
Dec. 31, 2013
Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 3,654 $ 3,005  
60-89 Days Past Due 430 4,809  
> 90 Days Past Due 5,004 3,571  
Total Past Due 9,088 11,385  
Current 365,602 345,708  
Total loans 374,690 357,093 366,827
Non-accrual Loans 8,673 11,678  
90 Days or More Past Due and Accruing 2,148 49  
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,296 161  
60-89 Days Past Due 72 2,852  
> 90 Days Past Due 932 3,339  
Total Past Due 2,300 6,352  
Current 27,562 27,708  
Total loans 29,862 34,060 34,404
Non-accrual Loans 2,656 5,811  
90 Days or More Past Due and Accruing 165     
Secured by 1-4 Family Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 646 1,561  
60-89 Days Past Due 287 316  
> 90 Days Past Due 977 136  
Total Past Due 1,910 2,013  
Current 153,388 139,948  
Total loans 155,298 141,961 142,446
Non-accrual Loans 1,357 953  
90 Days or More Past Due and Accruing 402 27  
Other Real Estate Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,604 1,077  
60-89 Days Past Due 71 1,636  
> 90 Days Past Due 3,082 74  
Total Past Due 4,757 2,787  
Current 150,012 143,181  
Total loans 154,769 145,968  
Non-accrual Loans 4,529 4,756  
90 Days or More Past Due and Accruing 1,581     
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 77 165  
60-89 Days Past Due        
> 90 Days Past Due 13 22  
Total Past Due 90 187  
Current 22,853 22,616  
Total loans 22,943 22,803 21,316
Non-accrual Loans 131 144  
90 Days or More Past Due and Accruing    22  
Consumer and Other Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 31 41  
60-89 Days Past Due    5  
> 90 Days Past Due        
Total Past Due 31 46  
Current 11,787 12,255  
Total loans 11,818 12,301 11,970
Non-accrual Loans    14  
90 Days or More Past Due and Accruing