Regulatory Matters (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Regulatory Matters (Additional Textual) [Abstract]    
Common equity tier 1 capital to risk-weighted assets, capital conservation buffer ratio 2.50%  
Tier 1 capital to risk-weighted assets, capital conservation buffer ratio 2.50%  
Total capital to risk-weighted assets, capital conservation buffer ratio 2.50%  
Minimum ratio of common equity tier 1 capital to risk-weighted assets 4.50%  
Minimum ratio of tier 1 capital to risk-weighted assets 6.00% 4.00%
Minimum ratio of total capital to risk-weighted assets 8.00% 8.00%
Minimum leverage ratio 4.00% 4.00%
Minimum capital maintained by trust $ 3,000  
Retained earnings 26,316 $ 20,944
Minimum    
Regulatory Matters (Additional Textual) [Abstract]    
Retained earnings $ 3,900  
Farmers National Banc Corp    
Regulatory Matters (Additional Textual) [Abstract]    
Minimum ratio of common equity tier 1 capital to risk-weighted assets 4.50%  
Minimum ratio of tier 1 capital to risk-weighted assets 6.00% 4.00%
Minimum ratio of total capital to risk-weighted assets 8.00% 8.00%
Minimum leverage ratio 4.00% 4.00%