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Subsequent Event - Acquisition of FC Banc Corp - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 0 Months Ended
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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 |  |

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