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Securities Available for Sale - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Security
Sep. 30, 2013
Sep. 30, 2014
Security
Sep. 30, 2013
Dec. 31, 2013
Security
Schedule of Available-for-sale Securities [Line Items]          
Securities held 47   47   77
Gross gains on the sales of securities $ 515,000 $ 160,000 $ 2,034,000 $ 419,000  
Gross losses on securities available for sale 46,000 3,000 366,000 140,000  
Securities with fair value $ 252,630,000   $ 252,630,000   $ 241,911,000
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 31   31   46
Securities held, less than 12 months category 22   22   38
Unrealized loss for security     less than 12 months    
Securities held, more than 12 months category         8
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member] | Maximum [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Unrealized loss for security     more than 12 months    
States and Political Subdivisions [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 16   16    
Securities held, less than 12 months category         31
Unrealized loss for security     less than 12 months    
States and Political Subdivisions [Member] | Maximum [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Unrealized loss for security     more than 12 months