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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Point
Jun. 30, 2013
Jun. 30, 2014
Point
Jun. 30, 2013
Dec. 31, 2013
Point
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Days principal payments should be past due for recognition of income on a loan be discontinued and previously accrued interest is reversed     90 days    
Loan charge-off, amount $ 93,000 $ 276,000 $ 226,000 $ 594,000  
Loan portfolio risk factor 1.18   1.18   1.18
Days loans are past due to be nonperforming loans     90 days   90 days
Commitments to lend additional funds 0   0   0
Principal charge-offs   0 0 0  
Allowance for loan losses related to TDRs modified 0 0 0 0  
Other Consumer
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off, amount 36,000 65,000 88,000 171,000  
Loan charge-off period     90 days    
Bank Overdrafts
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off period     45 days    
Qualitative Factor Economic Condition
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.20   1.20   1.20
Qualitative Factor Past Due Loans
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.20   1.20   1.20
Qualitative Factor Other Internal and External Factors
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.30   1.30   1.30
Overall Qualitative Factor
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in estimated allowance for loan losses     461,000   471,000
Partial charge-off loan
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off, amount     481,000    
Number of loan     13    
Classified Loans
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in estimated allowance for loan losses     465,000   521,000
Minimum
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period of performance borrower need to demonstrate for a loan be restored to accrual status     6 months    
Value of significant property $ 200,000   $ 200,000