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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Segment
BankingCenters
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]      
Number of operating industry segment 1    
Number of banking centers 16    
Cash reserve requirement $ 0 $ 0  
Investment in FHLB, Impairment Charges 0 0  
Loan held for sale maximum period 3 days    
Amount of other real state owned 0 25,000  
Impairment on goodwill 0 0  
Advertising expenses 175,000 190,000 175,000
Stock-based compensation expenses 0 0 0
Income tax recognized related to stock based compensation 0 0 0
Unrecognized compensation cost related to unvested share-based compensation awards outstanding 0    
Stock option granted         
Number of stock option require to purchase common stock 0 29,760 29,760
Prior Period Reclassification Adjustment Effect 0    
Held-to-maturity Securities [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Total Investment portfolio classified as Held-to-maturity 28.00%    
Equity Options [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Common stock purchase price   $ 18.00 $ 18.00
U.S. government agency and U.S. agency mortgage-backed securities [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
securities transferred from Available-for-sale to Held-to-maturity $ 39,000,000    
Minimum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalents, amounts due from banks and federal fund sold, maturity period 1 day    
Maximum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Cash and cash equivalents, amounts due from banks and federal fund sold, maturity period 90 days    
Buildings [Member] | Minimum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of individual assets 20 years    
Buildings [Member] | Maximum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of individual assets 40 years    
Equipment [Member] | Minimum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of individual assets 3 years    
Equipment [Member] | Maximum [Member]
     
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life of individual assets 10 years