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Investment Securities - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Government and agencies debt securities
   
Investment [Line Items]    
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis 3.50%  
Municipal obligations
   
Investment [Line Items]    
Gross gains on sales of available for sale securities $ 22,000  
Agency mortgage-backed securities
   
Investment [Line Items]    
Gross gains on sales of available for sale securities 7,000 35,000
Agency notes and bonds
   
Investment [Line Items]    
Gross gains on sales of available for sale securities   2,000
Collateralized Mortgage Obligations Issued By Private Enterprise
   
Investment [Line Items]    
Gross losses on sales of available for sale securities   18,000
Agency CMO
   
Investment [Line Items]    
Gross losses on sales of available for sale securities   8,000
Another Financial Institution
   
Investment [Line Items]    
Cost method investments,shares acquired 100,000  
Cost method investments $ 540,000  
Cost method investments, ownership percentage 7.00%