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Investment Securities - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Investment
Jun. 30, 2014
Investment
Jun. 30, 2013
Jun. 30, 2014
Investment
Jun. 30, 2013
Dec. 31, 2013
Investment [Line Items]            
Number of investment positions in continuous loss position 65 65   65    
Gross gains on sales of available for sale securities   $ 54,000 $ 0 $ 54,000 $ 21,000  
Number of shares acquired 31,750         100,000
Percentage of outstanding in common stock 9.00% 9.00%   9.00%    
Cost method investment (included in other assets) 711,000 711,000   711,000    
Municipal obligations
           
Investment [Line Items]            
Gross gains on sales of available for sale securities   $ 54,000 $ 0 $ 54,000 $ 21,000  
Government and agencies debt securities
           
Investment [Line Items]            
Number of investment positions in continuous loss position 64 64   64    
Percentage amount by which investment positions in continuous loss position had depreciated from amortized cost basis       1.80%