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Regulatory Matters (Details Textual) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
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%  
Capital conservation buffer ratio 2.50% 2.50%
Capital conservation buffer, additional capital amount required $ 68,900,000 $ 52,900,000
Minimum ratio of common equity tier 1 capital to risk-weighted assets 4.50% 4.50%
Minimum ratio of tier 1 capital to risk-weighted assets 0.060 0.060
Minimum ratio of total capital to risk-weighted assets 0.080 0.080
Minimum leverage ratio 0.040 0.040
Farmers National Banc Corp    
Regulatory Matters (Additional Textual) [Abstract]    
Minimum ratio of common equity tier 1 capital to risk-weighted assets 4.50% 4.50%
Minimum ratio of tier 1 capital to risk-weighted assets 0.060 0.060
Minimum ratio of total capital to risk-weighted assets 0.080 0.080
Minimum leverage ratio 0.040 0.040
Dividends that can be declared without prior approval $ 17,200,000  
Farmers Trust Company    
Regulatory Matters (Additional Textual) [Abstract]    
Minimum capital maintained by trust 3,000,000  
Dividends that can be declared without prior approval $ 648,000