Merger - Schedule of Financial Information for Former TCNB Financial Corp Included in Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Net interest income after provision for loan losses	$ 11,516	$ 9,516		$ 22,031	$ 18,932
Noninterest income	3,652	3,380		8,053	8,004
Net income	3,122	$ 2,240		$ 6,292	$ 4,951
Former TCNB Financial Corp [Member]
Business Acquisition [Line Items]
Net interest income after provision for loan losses	981		$ 1,233
Noninterest income	60		71
Net income	$ 416		$ 464