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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 06, 2015
Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]            
Goodwill $ 27,095   $ 27,095     $ 21,720
Amortization of intangible assets $ 189 $ 201 522 $ 604    
TCNB Financial Corp [Member]            
Goodwill And Intangible Assets [Line Items]            
Goodwill         $ 5,375  
Goodwill increased during period     $ 5,375