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Securities Available for Sale - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Security
Jun. 30, 2013
Jun. 30, 2014
Security
Jun. 30, 2013
Dec. 31, 2013
Security
Schedule of Available-for-sale Securities [Line Items]          
Securities held 40   40   77
Gross gains on the sales of securities $ 874 $ 0 $ 1,519 $ 259  
Gross losses on securities available for sale 272 0 320 137  
Securities with fair value $ 223,282   $ 223,282   $ 241,911
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]
          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 24   24   46
Securities held, less than 12 months category 11   11   38
Securities held, more than 12 months category         8
Unrealized loss for security     Less than 12 months    
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