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Stock plans - Summary of Stock Option Plan (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options, Outstanding, beginning of year 25,227 25,227 25,227
Options associated with merger 8,900    
Options, Granted         
Options, Exercised (3,150)    
Options, Forfeited (150)    
Options, Outstanding, end of year 30,827 25,227 25,227
Options, Exercisable, end of year 30,827 25,227 25,227
Weighted Average Price, Outstanding, beginning of year $ 29.66 $ 29.66 $ 29.66
Options associated with merger $ 30.93    
Weighted Average Price, Granted         
Weighted Average Price, Exercised $ 26.38    
Weighted Average Price, Forfeited $ 27.50    
Weighted Average Price, Outstanding, end of year $ 30.37 $ 29.66 $ 29.66
Weighted Average Price, Exercisable, end of year $ 30.37 $ 29.66 $ 29.66