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Investment securities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Security
Dec. 31, 2012
Security
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]      
Unrealized gains, net $ 1,826 $ 4,524  
Net of deferred income taxes 984 2,331  
Proceeds from the sale of investment securities available-for-sale 4,573 5,821 15,318
Gross realized gains 163 317 666
Gross realized losses 0 0 0
Income tax provision applicable to net realized gains 55 108 226
Carrying value of securities pledged 202,407 150,620  
Number of investment securities held 153 5  
Other-than-temporary impairments recognized 0    
U.S. Government-Sponsored Enterprises [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer 10.00% 10.00%  
Number of investment securities held 39 1  
Number of securities in continuous unrealized loss positions 12 months or longer 1    
State and Municipals, Tax-exempt [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 79    
State and Municipals, Taxable [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 16    
Mortgage-backed Securities, Issued by U.S. Government Agencies [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 15    
Corporate Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 1    
U.S. Government Agencies [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 1    
Common Stock [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Number of investment securities held 2 4  
Number of securities in continuous unrealized loss positions 12 months or longer   1  
Other-than-temporary impairments recognized   $ 0 $ 78