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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due $ 5,656 $ 3,005  
60-89 Days Past Due 2,271 4,809  
> 90 Days Past Due 3,905 3,571  
Total Past Due 11,832 11,385  
Current 347,701 345,708  
Total Loans 359,533 357,093 382,339
Non-accrual Loans 11,696 11,678  
90 Days or More Past Due and Accruing 111 49  
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,233 161  
60-89 Days Past Due 186 2,852  
> 90 Days Past Due 3,269 3,339  
Total Past Due 4,688 6,352  
Current 29,188 27,708  
Total Loans 33,876 34,060  
Non-accrual Loans 5,676 5,811  
Secured by 1-4 Family Residential [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 2,329 1,561  
60-89 Days Past Due 403 316  
> 90 Days Past Due 259 136  
Total Past Due 2,991 2,013  
Current 144,550 139,948  
Total Loans 147,541 141,961  
Non-accrual Loans 1,186 953  
90 Days or More Past Due and Accruing 34 27  
Other Real Estate Loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 1,913 1,077  
60-89 Days Past Due 1,532 1,636  
> 90 Days Past Due 377 74  
Total Past Due 3,822 2,787  
Current 138,897 143,181  
Total Loans 142,719 145,968  
Non-accrual Loans 4,675 4,756  
90 Days or More Past Due and Accruing 77    
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-59 Days Past Due 169 165  
60-89 Days Past Due 149    
> 90 Days Past Due   22  
Total Past Due 318 187  
Current 23,063 22,616  
Total Loans 23,381 22,803  
Non-accrual Loans 159 144  
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 12 41  
60-89 Days Past Due 1 5  
Total Past Due 13 46  
Current 12,003 12,255  
Total Loans 12,016 12,301  
Non-accrual Loans   $ 14