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Short Term Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Financial_Institution
Dec. 31, 2012
Dec. 31, 2011
Short-term Debt [Line Items]      
Federal home loan bank shares owned 14,529    
Percentage of investment to be maintained on total assets 0.20%    
Additional percentage of investment to be maintained on total advances 4.50%    
Percentage of credit available on total assets 20.00%    
Amount of credit available on total assets $ 63,716,000    
Long-term federal home loan bank advances 20,000,000    
Average short-term borrowings 1,838,000 399,000 811,000
Number of financial institution lending credit facility 2    
Unsecured Line Of Credit
      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing 3,000,000 3,000,000 3,000,000
Financial Bank One | Federal Funds
      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing 8,000,000    
Financial Bank Two | Federal Funds
      
Short-term Debt [Line Items]      
Line of credit, amount available for borrowing $ 5,000,000