Loans - Schedule of Aging of Past Due and Nonaccrual Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 401,083 $ 374,096
30 - 59 Days Past Due 998 865
60 - 89 Days Past Due 119 651
90 Days + Past Due 389 1,036
Nonaccrual 4,902 2,234
Total Past Due and Nonaccrual 6,408 4,786
Total ending loans balance 407,491 378,882
Construction & land development [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 11,015 12,494
30 - 59 Days Past Due      
60 - 89 Days Past Due      
90 Days + Past Due 350 950
Nonaccrual      
Total Past Due and Nonaccrual 350 950
Total ending loans balance 11,365 13,444
Commercial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 129,874 117,342
30 - 59 Days Past Due 35 15
60 - 89 Days Past Due 4 37
90 Days + Past Due 1   
Nonaccrual 2,226 84
Total Past Due and Nonaccrual 2,266 136
Total ending loans balance 132,140 117,478
Commercial Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 140,123 128,462
30 - 59 Days Past Due 470 111
60 - 89 Days Past Due    107
90 Days + Past Due    40
Nonaccrual 1,636 1,108
Total Past Due and Nonaccrual 2,106 1,366
Total ending loans balance 142,229 129,828
Residential Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 113,351 109,274
30 - 59 Days Past Due 426 616
60 - 89 Days Past Due 63 467
90 Days + Past Due 36 46
Nonaccrual 1,040 1,042
Total Past Due and Nonaccrual 1,565 2,171
Total ending loans balance 114,916 111,445
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 6,720 6,524
30 - 59 Days Past Due 67 123
60 - 89 Days Past Due 52 40
90 Days + Past Due 2   
Nonaccrual      
Total Past Due and Nonaccrual 121 163
Total ending loans balance $ 6,841 $ 6,687