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Investment Securities - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Security
Sep. 30, 2013
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]      
Number of debt securities continues loss position for more than twelve months 16    
Number of debt securities continues loss position for less than twelve months 48    
Investment securities available-for-sale carrying amount $ 63,400,000   $ 72,700,000
Gains realized on sales of securities available-for-sale 103,000 484,000  
Losses on sales of securities $ 0 $ 0