Subsequent Event - Acquisition of FC Banc Corp - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013 Farmers Citizens Bank [Member] Location	Oct. 11, 2013 Farmers Citizens Bank [Member] Subsequent Event [Member]
Business Acquisition [Line Items]
Outstanding equity interests of FC Banc Corp.					100.00%
Business acquisition share price					$ 30.00	$ 17.91
Number of branch locations					8
Total consideration paid to FC Banc Corp. shareholders						$ 41,600,000
Total consideration paid to FC Banc Corp. shareholders in cash			0	1,248,000		8,000,000
Total consideration paid to FC Banc Corp. shareholders in shares						1,873,879
Total value of common stock						33,600,000
Merger cost	$ 398,000	$ 0	$ 1,329,000	$ 0