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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items]      
Total $ 374,690 $ 357,093 $ 366,827
Construction and Land Development [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 29,862 34,060 34,404
Secured by 1-4 Family Residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 155,298 141,961 142,446
Other Real Estate Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 154,769 145,968  
Commercial and Industrial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 22,943 22,803 21,316
Consumer and Other Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 11,818 12,301 11,970
Pass [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 327,517 302,285  
Pass [Member] | Construction and Land Development [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 20,448 19,724  
Pass [Member] | Secured by 1-4 Family Residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 142,694 130,048  
Pass [Member] | Other Real Estate Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 130,111 118,663  
Pass [Member] | Commercial and Industrial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 22,446 21,563  
Pass [Member] | Consumer and Other Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 11,818 12,287  
Special Mention [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 18,411 19,660  
Special Mention [Member] | Construction and Land Development [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 3,032 3,500  
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 5,657 5,378  
Special Mention [Member] | Other Real Estate Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 9,524 10,227  
Special Mention [Member] | Commercial and Industrial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 198 555  
Special Mention [Member] | Consumer and Other Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total    0  
Substandard [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 28,762 35,148  
Substandard [Member] | Construction and Land Development [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 6,382 10,836  
Substandard [Member] | Secured by 1-4 Family Residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 6,947 6,535  
Substandard [Member] | Other Real Estate Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 15,134 17,078  
Substandard [Member] | Commercial and Industrial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total 299 685  
Substandard [Member] | Consumer and Other Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total    14  
Doubtful [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total        
Doubtful [Member] | Construction and Land Development [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total        
Doubtful [Member] | Secured by 1-4 Family Residential [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total        
Doubtful [Member] | Other Real Estate Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total        
Doubtful [Member] | Commercial and Industrial [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total        
Doubtful [Member] | Consumer and Other Loans [Member]
     
Financing Receivable, Recorded Investment [Line Items]      
Total