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Nature of Banking Activities and Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Entity
Dec. 31, 2012
Dec. 31, 2011
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Number of accounts included by parent company 6    
Recognition of other than temporary impairment on basis of credit loss description If there is no credit loss, there is no other-than-temporary impairment. If there is a credit loss, other-than-temporary impairment exists, and the credit loss must be recognized in net income and the remaining portion of impairment must be recognized in other comprehensive income.    
Gain (loss) on rate lock commitments $ 0    
Reclassified TDR value 1,900,000 6,300,000  
Largest amount of tax benefit realized by taxing authority 50.00%    
Liability for unrecognized tax benefits 0 0  
Potential common shares that would have a dilutive effect 0    
Average number of common shares outstanding basic and diluted 4,901,464 3,944,506 2,953,344
Advertising cost 269,000 364,000 368,000
Minimum [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Period of time between issuance of a loan commitment and closing and sale of the loan 30 days    
Management's policy on evaluation of impairment 250,000    
Minimum [Member] | Software [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Estimated useful lives of depreciation of premises and equipment 3 years    
Minimum [Member] | Premises and Equipment [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Estimated useful lives of depreciation of premises and equipment 3 years    
Maximum [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Period of time between issuance of a loan commitment and closing and sale of the loan 60 days    
Accrual status of loan 90 days    
Company not considered value of impairment on individual consumer, residential and small commercial loans $ 250,000    
Maximum [Member] | Software [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Estimated useful lives of depreciation of premises and equipment 7 years    
Maximum [Member] | Premises and Equipment [Member]
      
Nature Of Banking Activities And Significant Accounting Policies [Line Items]      
Estimated useful lives of depreciation of premises and equipment 40 years