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Securities Available for Sale - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Security
Mar. 31, 2013
Dec. 31, 2013
Security
Mar. 31, 2014
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]
Security
Dec. 31, 2013
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]
Security
Dec. 31, 2013
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE) [Member]
Maximum [Member]
Mar. 31, 2014
States and Political Subdivisions [Member]
Security
Dec. 31, 2013
States and Political Subdivisions [Member]
Security
Schedule of Available-for-sale Securities [Line Items]                
Securities held 53   77 34 46   19  
Securities held, less than 12 months category       22 38   11 31
Securities held, more than 12 months category         8      
Unrealized loss for security       Less than 12 months Less than 12 months More than 12 months Less than 12 months Less than 12 months
Sales of available for sale securities $ 67,567 $ 19,786            
Gross gains on the sales of securities 646 259            
Gross losses on securities available for sale 49 137            
Securities with fair value $ 221,172   $ 241,911