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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 06, 2015
Mar. 05, 2015
Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]              
Goodwill $ 26,841   $ 26,841       $ 21,720
Amortization of intangible assets $ 192 $ 201 334 $ 403      
TCNB Financial Corp [Member]              
Goodwill And Intangible Assets [Line Items]              
Goodwill         $ 5,121 $ 5,121  
Goodwill increased during period     $ 5,121