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Merger - Schedule of Financial Information for Former TCNB Financial Corp Included in Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]          
Net interest income after provision for loan losses $ 12,002 $ 10,684   $ 34,031 $ 29,615
Noninterest income 3,076 3,012   11,132 11,016
Net income 3,253 $ 2,306   $ 9,546 $ 7,257
Former TCNB Financial Corp [Member]          
Business Acquisition [Line Items]          
Net interest income after provision for loan losses 987   $ 2,291    
Noninterest income     71    
Net income $ 396   $ 859