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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 06, 2015
Goodwill And Intangible Assets [Line Items]        
Goodwill $ 27,095 $ 21,720    
Amortization of intangible assets 711 $ 769 $ 846  
TCNB Financial Corp [Member]        
Goodwill And Intangible Assets [Line Items]        
Goodwill       $ 5,375
Goodwill increased during period $ 5,375