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Loans - Allowances for Loan Losses and Ending Balances by Portfolio Segment and Based on Impairment Method (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Ending allowance balances attributable to loans:            
Individually evaluated for impairment $ 1,011   $ 784      
Collectively evaluated for impairment 4,052   4,301      
Total ending allowance balance 5,063 5,065 5,085 4,945 4,804 4,580
Loans:            
Loans individually evaluated for impairment 12,370   10,640      
Loans collectively evaluated for impairment 399,254   368,242      
Total ending loans balance 411,624   378,882      
Commercial [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 383   241      
Collectively evaluated for impairment 939   978      
Total ending allowance balance 1,322 1,141 1,219 1,316 1,176 933
Loans:            
Loans individually evaluated for impairment 7,128   5,576      
Loans collectively evaluated for impairment 126,109   111,902      
Total ending loans balance 133,237   117,478      
Commercial Real Estate [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 421   331      
Collectively evaluated for impairment 1,666   1,541      
Total ending allowance balance 2,087 2,192 1,872 1,815 1,824 1,902
Loans:            
Loans individually evaluated for impairment 3,427   3,220      
Loans collectively evaluated for impairment 139,147   126,608      
Total ending loans balance 142,574   129,828      
Residential Real Estate [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 207   212      
Collectively evaluated for impairment 950   993      
Total ending allowance balance 1,157 1,054 1,205 1,174 1,282 1,096
Loans:            
Loans individually evaluated for impairment 1,815   1,844      
Loans collectively evaluated for impairment 116,731   109,601      
Total ending loans balance 118,546   111,445      
Construction & Land Development [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 0          
Collectively evaluated for impairment 51   178      
Total ending allowance balance 51 145 178 162 134 253
Loans:            
Loans individually evaluated for impairment 0          
Loans collectively evaluated for impairment 9,876   13,444      
Total ending loans balance 9,876   13,444      
Consumer [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 0          
Collectively evaluated for impairment 44   91      
Total ending allowance balance 44 77 91 144 68 76
Loans:            
Loans individually evaluated for impairment 0          
Loans collectively evaluated for impairment 7,391   6,687      
Total ending loans balance 7,391   6,687      
Unallocated [Member]
           
Ending allowance balances attributable to loans:            
Individually evaluated for impairment 0          
Collectively evaluated for impairment 402   520      
Total ending allowance balance $ 402 $ 456 $ 520 $ 334 $ 320 $ 320