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Merger accounting - Schedule of Pro Forma Condensed Combined Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Combinations [Abstract]      
Net interest income after loan loss provision $ 52,734 $ 52,917 $ 51,312
Noninterest income 16,080 16,287 18,186
Noninterest expense 52,295 49,827 56,319
Net income $ 16,519 $ 19,377 $ 13,179
Net income per share $ 2.19 $ 2.55 $ 1.73